OBSIDIAN - Caucasus Mountains, Armenia
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Caucasus Mountains, Armenia
Obsidian is a natural volcanic glass, formed when lava from a volcano cools extremely quickly leaving no time for crystals to grow. Astonishingly, it is the same chemical composition as granite but granite has cooled very slowly deep underground forming large crystals.
The lava that produces obsidian is usually sticky and highly viscous, resulting in explosively violent volcanic eruptions.
Caucasus Mountains, Armenia
Obsidian is a natural volcanic glass, formed when lava from a volcano cools extremely quickly leaving no time for crystals to grow. Astonishingly, it is the same chemical composition as granite but granite has cooled very slowly deep underground forming large crystals.
The lava that produces obsidian is usually sticky and highly viscous, resulting in explosively violent volcanic eruptions.
This piece has an impressive conchoidal fracture with cone of percussion and is partially transparent.
Caution: Just like man-made glass, broken pieces of obsidian have very sharp edges.
Click on a picture for a larger image
Size: 13 x 9 x 3.8 centimetres
Weight: 322 grams
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