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.
Size: 6-10cm
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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