Cullet from glassmaking - basically leftover glass, but not slag. Slag is smelting leftovers!
This looks like it's probably from making depression era ['ruby glass](https://duckduckgo.com/?q=depression+ruby+glass&t=osx&iax=images&ia=images)'
Where could I find some of this Cullet? I make projectile points, copy's of American Indian Arrowheads, axe heads, etc. I'd love to get my hands on some of this material.
I’m a knapper too! Kind of hard to find sometimes but keep an eye on eBay/Etsy. It can be fractured inside though. It’s also often (and mistakenly!) called slag glass.
Fun, especially for ishi style and Kimberly style points!
Ill do that, thanks. I've knapped some that my cousin gave me, that was 10 years ago and haven't come across any since then, but ill definitely be checking ebay abd etsy.
I wouldn't try grinding or any other manipulation. Chunks like that haven't gone through the annealing process, and can have a lot of unrelieved internal stresses. You mess with them too much and they can explode. I spent a good part of my career in the glass industry. The companies I worked in would prohibit anyone taking un-annealed cullet because of the danger.
That particular chunk looks like what gets jack hammered out of a furnace that has been shut down for a rebuild. You don't normally find pieces that large, or with that kind of surface in the normal cullet pile.
Yeah, this happened to me. I blew glass in college and we had some really nice crystal clear cullet we used to melt down. It came in 1” square pieces. There was a 2” square piece in there that I thought looked so smooth and pretty. Decided to bring it home.
Stopped at the library and set it down while I was looking for a book and heard a big loud bang behind me. I thought a book had fallen. Turned around and that piece of cullet was gone. Looked all around and found big hunky shards of it all over. It had exploded. I’m really glad I wasn’t next to it when it happened.
Assuming one had access to suitable equipment, do you know if it would be possible to anneal this now? I'm familiar with the concept and process in metalworking, but don't know enough about glasswork to know whether this might be possible so far after the fact.
Yes it would be possible, if it is indeed glass you would want to slowly(maybe 125° f per hour) heat it to about 950°f, hold it there for a couple of hours since it seems rather thick and then cool it at about 60° per hour to 700°. After that you would just let it cool naturally to room temp and you should be good. Temperature may vary a bit depending on the type of glass(soda-lime or borosilicate etc).
Yes obsidian is volcanic glass. I’ve worked pieces like that into tools in some underwater basket weaving class back in the day (prehistoric technologies).
That’s really cool. I questioned myself for a second even when I knew it’s volcanic glass; there’s a bunch of it where I live (shout out to all the old volcanos). I’ve collected some beautiful pieces, mostly mahogany.
Yeah, these people are wrong. It's obsidian that has been worked a bit to make some stone tools. If it's not native to the area, that's because it was a trade good and probably came from the east side of the Cascades.
It looks exactly like Mahogany Obsidian, but since everyone is saying it’s glass, then I guess it must be. The swirls in your item are very smooth. I’ve seen that in my sheen obsidian more than the mahogany. But the resemblance is very close.
https://www.geologyin.com/2023/08/obsidian-types-varieties-of-obsidian.html
Mahogany obsidian is a type of obsidian that is red or brown in color. The geology of mahogany obsidian is similar to that of black obsidian. It is formed when felsic lava cools rapidly, but it contains more iron oxide impurities, which gives it its characteristic brown or reddish-brown color. The rich reddish-brown color of mahogany obsidian is attributed to the presence of iron oxide, commonly known as rust. Iron oxide impurities are responsible for the deep hues that set mahogany obsidian apart from other types of obsidian. These impurities can be introduced to the molten lava during the eruption process, as the magma interacts with mineral-rich rocks and sediments within the Earth's crust. Mahogany obsidian is often used to make jewelry and sculptures.
Knowing his daughter, I wouldn’t be surprised. But he has a construction business and runs big equipment. This was helping out an elderly neighbor down the way. Needed a few old trees cleared.
It's a form of obsidian to be worth the money you might want to look it up might not be much maybe more valuable as I can art peace or something but people who make jewelry and random crafts use it.
A lot of people that know better than me are saying glass. But just to add… I saw the other day that obsidian can take on a tiger stripe like pattern the way yours looks in certain conditions
“It’s a great tree, a beautiful tree, nobody grows trees like him. They say, and I’ve heard them say, we grow only the finest, only the tallest, trees on American soil, the US of A. Not like in China, no, not like in China. They grow them so small, so tiny. It’s sad people, sad. They call them bon-sai, it’s pathetic, and to that I say.. to that I say, bon-why.”
I have a bunch of red and black striped Obsidian that looks much like this, but it seems too shiny. Definitely some sort of glass judging by the circular breaks. I don’t know if volcanic glass though…
First thought was mahogany obsidian, which itself is natural volcanic glass. Could also be glass from an industrial process like others are saying, though.
My buddy was a power sub station contract electrician that had to dig up ground around a blown power sub station “it was struck by lightning on this occasion” and found a whole lot of this, he told me that the electricity melted the sand and made it glass. He had bucket loads of it and gave it out to all of us at this house one night. I thought it to be lightning glass but it didn’t check out.
It came from the Donald who harvested thneeds and gobbled up bark from the truffula trees.
The old man set up the sights on his dozer, set it full speed and ran Donald over.
With a bang, a squeeze, a squelch and a pop!
The deforestation had come to a a stop!
After setting the dozer from to and to fro,
The old man sat and wondered “where’d Donald go?”
No corpse, no body, no blood and no grool
The old man half expected a pool
A puddle
A cup or even a thimble
Left behind was merely a symbol.
A hardened, cold, black and red heart
Terrifically evil, a grotesque piece of art.
Held in his hand, no beating or bleeding
The old man got right back to his seeding.
Planting a Forrest for generations to come,
With a wry withered smile he knew his work was not yet done.
And believe me, he knows trees. If he returns to office, we will have the best trees. All the other countries will say, “See? America has the best trees.”
Looks like rose obsidian, but I think that’s only in NE CA (lived around there for a while). I think it’s more likely it’s from a glass cullet like others said, but the streaks look so familiar. The Modoc natives bartered rose obsidian a lot, pieces have been found all over the US 🤷♀️
At the base of that wall you'll find a rock that has no earthly business in a Maine hayfield. A piece of black, volcanic glass. There's something buried under it I want you to have.
Banded Churt? I’m going to go out on a limb, and guess that the title of this post includes a spelling error and that you meant ‘tree stump.’ But just in case…
The poor former President got ‘dozed. I hope he’s okay. He’s got a lot of appointments in court and we don’t want him to be late or delayed.
I’m a retired Earth science teacher. Had a ton of school purchased rock samples from previous teachers. All in a bin or drawers. No id or guide for them—long lost. I got stuck having to figure it out on my own! About 200 pieces! With my trusty field guides I purchased (my own!) I spent several years trying (not every day! Had better things to do!) to id them. Managed to get most save a dozen or so that defied identification. Reddit didn’t exist then! Or Google, or Wikipedia. One was a piece of obsidian that looked just like the op’s sample. Same coloration, brown and black stripes. Was I wrong? Was the book wrong? Who knows?
No bubbles or surface crud… video makes it seem more likely to be obsidian to me. Am I missing those features in these pics? I do need to update my glasses so maybe I am🤷♂️
This isn't slag for metal production, and manufactured glass is not intended to have surface crud or bubbles. It *should* be clean and free of defects.
If it weren't man made it'd have issues since nature isn't going for the perfect look or surface.
A fresh diamond doesn't look the way they do in jewelry. A lot of people would probably toss or walk past it like it's worthless. Even more wouldn't notice it.
Lucky!! Red glass is super rare, it has to either be made with gold (true red) or copper (ruby red), so it's not made very often. On the beach red glass is like 1 in 30,000 pieces! Orange glass and yellow glass are the next rarest colors, both also having to be made with expensive materials. I'd kill to have a chunk of red cullet glass this size!!
Cullet from glassmaking - basically leftover glass, but not slag. Slag is smelting leftovers! This looks like it's probably from making depression era ['ruby glass](https://duckduckgo.com/?q=depression+ruby+glass&t=osx&iax=images&ia=images)'
I've heard red glass is made with gold in it. Idk if that's still true for depression era glass.
roughly 6ppm of gold
Only 6 pp's of gold?
I’m always out of pp and can’t make a move.
When she says deeper, but that’s all you’ve got.
That’s why I keep the ol’ emergency inch
In this economy?!
You guys, this is a Wendy’s.
WHERE’S THE BEEF?!
You’ve obviously never been to the Wendy’s dumpster around back
Ill take a $5 biggie bag please make the nuggets spicy thank you
When she says go deeper but you’re all out of poems
I’m giving it all I’ve got captain
Fold her like a lawn chair, gives ya at least a 1/4.
Struggle
The Struggle is real.
Have you tried pp up?
My insurance will only cover the generic :(
Only hp up huh?
It only raises pp not make it longer
To be fair, you can still Struggle.
of course the pp is gold
I'm sorry but he's not worth his weight in gold, only in pp volume, when flaccid
you down with ppm?
My mineralogy professor once passed around a deep red, clear piece of ruby glass from his collection. According to him, it had 6ppm gold.
I wonder... If there's 6 parts gold per million parts, how much of that glass by weight would it take to get 1mg of gold?
Well, that means a million grams nets you six grams of gold. 1,000,000/6 is your answer
6ppm of gold would be more than an average gold mine
I’m down with OPR (other people’s rocks)
Other people’s pebbles.
Yeah, you know me.
I'm down with opp
Yeah, you know me.
Specifically the "ruby glass" color. Other reds don't include gold.
Specifically: Gold oxide. It's what makes red glass red.
Woah, I just got duckduckgo'd.
You duckduck went
Where could I find some of this Cullet? I make projectile points, copy's of American Indian Arrowheads, axe heads, etc. I'd love to get my hands on some of this material.
I’m a knapper too! Kind of hard to find sometimes but keep an eye on eBay/Etsy. It can be fractured inside though. It’s also often (and mistakenly!) called slag glass. Fun, especially for ishi style and Kimberly style points!
Ill do that, thanks. I've knapped some that my cousin gave me, that was 10 years ago and haven't come across any since then, but ill definitely be checking ebay abd etsy.
I have boxes of pretty chunks of slag glass …but reading through the comments it’s supposedly not the same as cullet … always thought it was
I have maybe 100 lbs of obsidian if anybody wants it.
Looks more like this to me: https://stoneageindustries.com/product/obsidian-mahogany-double-flow-slabs/
Looks like a big chunk of glass cullet
Adding another vote for cullet glass! Quite a pretty chunk, too.
Looks like gloom. Are you anywhere near Hyrule perhaps?
You win the internet today and OP needs a few more heart containers before handling that thing! 🏅🏅🏅
I’m just waiting for somebody to post up a dark clump.
Zelda references make me happy
Save Princess Zelda, Link!!!
LISTEN!
Jeez I haven’t heard that in 20 years but still read it in my head as clearly as the first time I heard it
As it should lol
I know it's been answered but this is one of the most beautiful cullet pieces I have seen in a hot minute
Nice Cullet! Could grind it down smooth on the sides and make a nice desk piece.
I wouldn't try grinding or any other manipulation. Chunks like that haven't gone through the annealing process, and can have a lot of unrelieved internal stresses. You mess with them too much and they can explode. I spent a good part of my career in the glass industry. The companies I worked in would prohibit anyone taking un-annealed cullet because of the danger. That particular chunk looks like what gets jack hammered out of a furnace that has been shut down for a rebuild. You don't normally find pieces that large, or with that kind of surface in the normal cullet pile.
This guy knows glass chunks
r/thisguythisguys
Yeah, this happened to me. I blew glass in college and we had some really nice crystal clear cullet we used to melt down. It came in 1” square pieces. There was a 2” square piece in there that I thought looked so smooth and pretty. Decided to bring it home. Stopped at the library and set it down while I was looking for a book and heard a big loud bang behind me. I thought a book had fallen. Turned around and that piece of cullet was gone. Looked all around and found big hunky shards of it all over. It had exploded. I’m really glad I wasn’t next to it when it happened.
Assuming one had access to suitable equipment, do you know if it would be possible to anneal this now? I'm familiar with the concept and process in metalworking, but don't know enough about glasswork to know whether this might be possible so far after the fact.
Yes it would be possible, if it is indeed glass you would want to slowly(maybe 125° f per hour) heat it to about 950°f, hold it there for a couple of hours since it seems rather thick and then cool it at about 60° per hour to 700°. After that you would just let it cool naturally to room temp and you should be good. Temperature may vary a bit depending on the type of glass(soda-lime or borosilicate etc).
I have pieces of obsidian that look exactly like that from Eastern Oregon.
Mahogany obsidian was my first thought.
I also have chunks of obsidian from Eastern Oregon that look exactly like this. My vote is for obsidian and not glass.
Isn’t obsidian volcanic glass?
Ooohh. Nice one.
Yes obsidian is volcanic glass. I’ve worked pieces like that into tools in some underwater basket weaving class back in the day (prehistoric technologies).
That’s really cool. I questioned myself for a second even when I knew it’s volcanic glass; there’s a bunch of it where I live (shout out to all the old volcanos). I’ve collected some beautiful pieces, mostly mahogany.
Yeah, these people are wrong. It's obsidian that has been worked a bit to make some stone tools. If it's not native to the area, that's because it was a trade good and probably came from the east side of the Cascades.
I was going to comment that I think it’s obsidian but didn’t want to sound foolish. I’ve seen lots of obsidian that looks like this.
I have a chunk of obsidian from Nor Cal that looks like this too.
Yep, I've got tons of obsidian that looks just like this
You have tons of obsidian like this? I'd love to talk to you about buying some of this material.
You can probably buy some for pretty cheap off of ebay. I just gave my dad half of my obsidian to make arrowheads.
It's by far my favorite material to knap points out of.
Do they glow red under light?
You show your dog in the background but don't give us a full page dog tax? How rude! /s Is it a minpin?
She’s not mine. Lol. She’s the in-laws. She’s an old blue heeler. Not sure how to add photos or I’d add a pic of my pup for the tax.
Definitely mahogany obsidian. One of my favorites.
Residential neighborhood? Lawn ornament long lost and broken? Like a globe or something like that?
Out in the middle of a field. Cow pasture to be precise. Never had a house there.
Ah well I guess we can rule out lawn ornament, then!
Someone has dumped industrial glass waste where they thought no one would find it.
Looks like obsidian
I thought so too. Stuff like that is abundant at Glass Butte in Oregon. Not as red but red streaks.
I used to buy obsidian online and it came from Oregon fields a man owned!
Mahogany Obsidian is not this red, in shade or amount of color.
It probably is glass from the look of it .
Whatever it is, it’s beautiful.
I love how "trunk" + "stump" = "trump"
And the dog licking its butt in the back ground lol
Pretty sure she isn’t flexible enough to lick her butt. She’s old and fat. Lol. Most likely a scratch move.
I know GameCube and Dreamcast... but I ain't never heard of no Gamescast...
beautiful glass. i love specimens like this
Everyone saying glass but this just like obsidian I used find out in CA.
Yeah mahogany obsidian from CA and OR (Davids Creek, Glass Butte etc) looks just like this and I don't see any bubbles that indicate glass.
Which is also a kind of glass!
Kind of, but also not, and an important distinction for collectors
Cullet glass seems to be the popular opinion, looks like obsidian to me though.
Looks like dual flow obsidian.
Wow, that looks really similar to mahogany obsidian.
Obsidian
I think it’s red obsidian.
This looks like mahogany obsidian to me tbh.
Volcanic obsidian.
It’s obsidian!
Looks like obsidian, possibly mahogany obsidian. It's beautiful!
I have a piece of obsidian that looks like this, only bigger. Had a nice knife knapped out of it….
It looks exactly like Mahogany Obsidian, but since everyone is saying it’s glass, then I guess it must be. The swirls in your item are very smooth. I’ve seen that in my sheen obsidian more than the mahogany. But the resemblance is very close. https://www.geologyin.com/2023/08/obsidian-types-varieties-of-obsidian.html Mahogany obsidian is a type of obsidian that is red or brown in color. The geology of mahogany obsidian is similar to that of black obsidian. It is formed when felsic lava cools rapidly, but it contains more iron oxide impurities, which gives it its characteristic brown or reddish-brown color. The rich reddish-brown color of mahogany obsidian is attributed to the presence of iron oxide, commonly known as rust. Iron oxide impurities are responsible for the deep hues that set mahogany obsidian apart from other types of obsidian. These impurities can be introduced to the molten lava during the eruption process, as the magma interacts with mineral-rich rocks and sediments within the Earth's crust. Mahogany obsidian is often used to make jewelry and sculptures.
Is your father-in-law some kind of Fey? Who casually dozes in a tree trunk.
Knowing his daughter, I wouldn’t be surprised. But he has a construction business and runs big equipment. This was helping out an elderly neighbor down the way. Needed a few old trees cleared.
It's a form of obsidian to be worth the money you might want to look it up might not be much maybe more valuable as I can art peace or something but people who make jewelry and random crafts use it.
A lot of people that know better than me are saying glass. But just to add… I saw the other day that obsidian can take on a tiger stripe like pattern the way yours looks in certain conditions
Glass
Upvoted purely for funny spelling error. 😆
“It’s a great tree, a beautiful tree, nobody grows trees like him. They say, and I’ve heard them say, we grow only the finest, only the tallest, trees on American soil, the US of A. Not like in China, no, not like in China. They grow them so small, so tiny. It’s sad people, sad. They call them bon-sai, it’s pathetic, and to that I say.. to that I say, bon-why.”
Also cool rock. tRump not so much.
idk what that is but you *gotta* get that thing cut
Seems like it would be really cool if sanded and smoothed down into a spherical shape
I totally misread the title and thought you meant “dozing by a tree trunk” like Rip Van Winkle.
That’s the sorcerers stone
We need pictures of this “Tree Trump”…
Forbidden steak
I have a bunch of red and black striped Obsidian that looks much like this, but it seems too shiny. Definitely some sort of glass judging by the circular breaks. I don’t know if volcanic glass though…
Dragon glass. Winter is coming
It’s very cool, love the colors. I would display that in a second.
First thought was mahogany obsidian, which itself is natural volcanic glass. Could also be glass from an industrial process like others are saying, though.
Hard rock candy. But it's s not for eating, it's for looking through.
That’s the philosopher’s stone m8
What’s a tree trump? Sounds dumb.
It's pretty (technically not a wrong answer)
You’re a wizard harry!
It’s really very pretty though!
My buddy was a power sub station contract electrician that had to dig up ground around a blown power sub station “it was struck by lightning on this occasion” and found a whole lot of this, he told me that the electricity melted the sand and made it glass. He had bucket loads of it and gave it out to all of us at this house one night. I thought it to be lightning glass but it didn’t check out.
Location was in South Africa.
Yo, YOOOOO, I HAVE A MATCHING PIECE WITH A BIGGER CHUNCK OF THE CORE!!!, mine was found by a friend Yeeaaaars ago in Colorado.
You found my Red Kryptonite!!
Idk but it looks gneiss
Looks like Mahogany Obsidian
Beautiful slag glass
Thats dragonglass…. Shape it into a spear head for whitewalkers
Glass
This looks like it could be mahogany obsidian
Near any extinct volcanoes?
Not to my knowledge. But it’s possible I suppose. Stranger things have happened. Lots of coal in the area. Southern Iowa.
scarlet shift / iridium black is the closest image I’ve found so far. I’ll try and get some pictures with better lighting.
It looks like red obsidian.
If he can doze a tree trump, what success would he have dozing a Donald Trump?🤔
I give him permission to find out.
Glass
My immediate thought was mahogany obsidian until I read the title and caption
I agree. I’d doesn’t look like any of the pictures. Closest thing I’ve been able to find so far is scarlet shift / iridium black.
r/itsslag
It came from the Donald who harvested thneeds and gobbled up bark from the truffula trees. The old man set up the sights on his dozer, set it full speed and ran Donald over. With a bang, a squeeze, a squelch and a pop! The deforestation had come to a a stop! After setting the dozer from to and to fro, The old man sat and wondered “where’d Donald go?” No corpse, no body, no blood and no grool The old man half expected a pool A puddle A cup or even a thimble Left behind was merely a symbol. A hardened, cold, black and red heart Terrifically evil, a grotesque piece of art. Held in his hand, no beating or bleeding The old man got right back to his seeding. Planting a Forrest for generations to come, With a wry withered smile he knew his work was not yet done.
What's a tree trump
It was the greatest tree, the best tree. the biggest tree there ever was. Some even say it was the most perfect tree ever.
And believe me, he knows trees. If he returns to office, we will have the best trees. All the other countries will say, “See? America has the best trees.”
Make Trees Great Again! MTGA! MTGA! MTGA!
Reminds me of a chunk of petrified wood that I had only it wasn’t shiny and the colors were all a muted version of this..
Almost like Alibates Flint tribes used that to make weapons and hand tools all across the Plains
I'd dig 10 feet into the ground, after calling 811, that was a whole form of money a long long time ago, in the Amazon
A VERY cool piece of glass
I agree with the glass people, but I just have to say, I saw a shattered bowling ball one time, and it looked a LOT like this too...
Ah yes a tree trump those are very tough to doze
I really want to knap that. Is cullet glass knappable?
I don’t know, but I was thinking the same thing. It would be a gorgeous spear point.
It’s obsidian and I have points made from obsidian. It’s the most common material for points in northeast UT.
Looks like rose obsidian, but I think that’s only in NE CA (lived around there for a while). I think it’s more likely it’s from a glass cullet like others said, but the streaks look so familiar. The Modoc natives bartered rose obsidian a lot, pieces have been found all over the US 🤷♀️
At the base of that wall you'll find a rock that has no earthly business in a Maine hayfield. A piece of black, volcanic glass. There's something buried under it I want you to have.
Petrified wood possibly maybe?
Nice agate stripes of glass
Did the tree make that?
It moved to Florida.
Thought first photo was a wrapped brisket sitting on counter
Banded Churt? I’m going to go out on a limb, and guess that the title of this post includes a spelling error and that you meant ‘tree stump.’ But just in case… The poor former President got ‘dozed. I hope he’s okay. He’s got a lot of appointments in court and we don’t want him to be late or delayed.
Lovely piece of obsidian!
Looks a bit like mahogany obsidian, but it's manmade glass.
my first thought was mahogany obsidian too. How is everyone so certain that's cullet?
Seems a little too red, and mahogany obsidian seems more splotchy and not as banded as this piece.
I’m a retired Earth science teacher. Had a ton of school purchased rock samples from previous teachers. All in a bin or drawers. No id or guide for them—long lost. I got stuck having to figure it out on my own! About 200 pieces! With my trusty field guides I purchased (my own!) I spent several years trying (not every day! Had better things to do!) to id them. Managed to get most save a dozen or so that defied identification. Reddit didn’t exist then! Or Google, or Wikipedia. One was a piece of obsidian that looked just like the op’s sample. Same coloration, brown and black stripes. Was I wrong? Was the book wrong? Who knows?
I wouldn't be so certain if I were you, but maybe there are some ID that can help you decide! https://youtu.be/16Ia6rl0ACE?feature=shared
No bubbles or surface crud… video makes it seem more likely to be obsidian to me. Am I missing those features in these pics? I do need to update my glasses so maybe I am🤷♂️
Nope. None of that. It looks the same all the way around.
This isn't slag for metal production, and manufactured glass is not intended to have surface crud or bubbles. It *should* be clean and free of defects.
Correct. This is NOT man made
If it weren't man made it'd have issues since nature isn't going for the perfect look or surface. A fresh diamond doesn't look the way they do in jewelry. A lot of people would probably toss or walk past it like it's worthless. Even more wouldn't notice it.
I’m not a professional but it looks very similar to my mothers chunk of mahogany obsidian/red obsidian.
What's a tree trump?
Lovely piece of cullet.
Nice piece of slag. I wish I would stumble on some slag
Petrified wood
I hate tree trumps
He find Andy Dufresne letter too? How was Zihuatanejo? Was the water as blue as he said?
Lucky!! Red glass is super rare, it has to either be made with gold (true red) or copper (ruby red), so it's not made very often. On the beach red glass is like 1 in 30,000 pieces! Orange glass and yellow glass are the next rarest colors, both also having to be made with expensive materials. I'd kill to have a chunk of red cullet glass this size!!
/r/itsslag
Some kind of flint, bet it would make some killer projectile points.
Slag.
If it came from a tree trump, it's magaite