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enter image description hereenter 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

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  • $\begingroup$ 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 $\endgroup$ – Rick Aug 4 '17 at 17:37
  • $\begingroup$ Please read our guide earthscience.meta.stackexchange.com/a/125/94 for rock identification questions. Inparticular the photographs are out of focus! $\endgroup$ – winwaed Aug 4 '17 at 18:24
  • $\begingroup$ Hard to tell anything from the out of focus pictures, but the concoidal fracture and colour suggests man-made glass to me... $\endgroup$ – winwaed Aug 4 '17 at 18:25
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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.

enter image description here

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

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