Other Industrial Cut Stones & Stone Products Newsgroup

Location: INDONESIA, DKI JAKARTA JAKARTA SELATAN

Obsidian Rock.
Obsidian stone is actually not mine but rather a kind of lava rocks spewed from the volcano crater. Obsidian is not really a rock or mineral, but rather a natural glass formed from the cooling of volcanic lava that quickly, because the process is too rapid cooling then the rare formation of crystals in it, so nothing in the crystal structure of the mineral obsidian stone like the other. The color is clear as glass and the color black sometimes smooth, dark red, slightly green or gray. This rare stone that is yellow or red, white or blue. Obsidian is often found in a state mengkilau although not polished smooth. Obsidian is made of 70% silicon dioxide and even more if certain minerals minerals mixed color will change.