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Post by persephone on Jul 3, 2012 8:28:51 GMT -5
The top one has a few shades of blue, and the bottom one is also blue but a very different texture.. I've looked through a rocks & minerals book but I couldn't find anything that matched. Any ideas would be appreciated! Attachments:
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Post by arappaho on Jul 3, 2012 20:35:11 GMT -5
Just guessing here, but looks like a chert type of rock that most
probably has been dyed that blue color making it hard to find
another example of it to ID it from.
They both look like the same stuff only the top one is more of the
center of the rock and the bottom one has more of the exterior
rind on it.
Nice work, but I prefer the natural colors in rock.
Joe
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Post by persephone on Jul 4, 2012 16:09:16 GMT -5
I didn't dye them, that was how I found them. I found a few others like it by a lake. I'm stumped!
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Post by leonardo on Jul 4, 2012 18:11:29 GMT -5
Maybe common opal.....what part of the country did you find them.
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Post by persephone on Jul 4, 2012 18:29:22 GMT -5
I'm in southern New Jersey. I've found mostly obsidian and green fluorite, but I have 5 or 6 small pieces of what looks like cobden chert and a few pieces that look like the bottom one in the picture.
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Post by arappaho on Jul 4, 2012 19:14:49 GMT -5
Very good, persephone, that's what we needed to know.  You are most likely finding bits of "slag glass". Obsidian does not occur naturally east of the Mississippi, so either it's obsidian that has been thrown out by someone in the past or slag glass. Slag glass used to refer only to the by-product of iron smelting operations, but now includes intentionally made slag glass as well. Here's a link with a brief explanation and Google "Images of Slag Glass" for pics. www.glassencyclopedia.com/slagglass.htmlSlag glass is very popular these days. Joe |
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Post by persephone on Jul 4, 2012 21:30:53 GMT -5
Wow, thanks for the info!
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joanne
Senior Member
Posts: 48
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Post by joanne on Jul 5, 2012 8:22:07 GMT -5
To me it looks alot like cullet, that is slag glass. It comes in alot of colors,I have a few of them, Joanne
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