Obsidian

It's one of the most interesting types of rock in geology.

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It is obsidian rock which is a extrusive igneous rock and it shows holohyaline texture which is a glassy from outside and it forms at the…

Sparkles for All!.

3.6 x 2.7 x 1.7 cm. Several fine, sharp, lustrous, black cyclic twinned crystals measuring up to 1.5 cm. Copyright © Rob Lavinsky & irocks.com

Doyou Know what is obsidian rock ? or why is obsidian black? and where you can find obsidian rock? so this article is helpful ... Read It Now