Nevadian Obsidian rough stone from the United States. This variety has polymorphic quartz spherules called cristobarite, give the appearance of snowflakes to this volcanic glass.
We can find varieties in the color of obsidian or effects on its surface. As a rule, it is black (or greyish) but we also find it with the golden surface, with the iridescence of the rainbow, with white spots or rounded pearls called Apache tears. > Obsidian is often used for jewelery or decoration but, formerly, it was used as a cutting tool and even arrowheads
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