What are these rocks

Question

enter image description here This Crystal has a couple gas bubbles and impurities in the very center of it it breaks only one way it is 4720 carats very beautiful very hard

I live in Oregon I traded a couple crystals for this rock because I thought it was really awesome never seen something like this before he said that it came from Brazil — Rick, Aug 04 '17 at 17:37
Please read our guide https://earthscience.meta.stackexchange.com/a/125/94 for rock identification questions. Inparticular the photographs are out of focus! — winwaed, Aug 04 '17 at 18:24
Hard to tell anything from the out of focus pictures, but the concoidal fracture and colour suggests man-made glass to me... — winwaed, Aug 04 '17 at 18:25

score 4 · Answer 1 · edited Jun 18 '20 at 08:25

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looks like a broken block of glass from a glass factory, called glass slag or chunk glass, you can get a whole range of hardness and color depending on what type of glass they were making. People often use it to make art.

edited Jun 18 '20 at 08:25

Community

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answered Aug 05 '17 at 04:22

John

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score 0 · Answer 2 · answered Aug 06 '17 at 01:05

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Definitely looks like broken, human-made glass. The presence of bubbles pretty much clinches it.

answered Aug 06 '17 at 01:05

Dr. G

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What are these rocks

2 Answers2