SOLD | Obsidian Kugel | Mexiko wonder stone preserving the structure of the

preserving the structure of the wood

Its physical properties are similar to those of quartz

gerippte Struktur sowie eine Reihe markanter

Das Fossil selbst trägt die unverwechselbare Signatur der Hell Creek Formation

SOLD | Obsidian Kugel | Mexiko wonder stone preserving the structure of theOrigin: Mexico Size: Diameter 21cm Description: Spherical, polished to bring out rich black tones. Cut in Mexico. Additional Information: Obsidian is a naturally occurring volcanic rock glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (approximately 65 to 80 percent), has little water, and a chemical composition similar to rhyolite. Obsidian has a glassy luster.