MAHOGANY OBSIDIAN - Georgia
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MAHOGANY OBSIDIAN
Caucasus Mountains, Georgia
Obsidian is a natural volcanic glass, formed when lava from a volcano cools extremely quickly leaving no time for crystals to grow. Amazingly, 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.
The brown and red varieties of obsidian are called 'mahogany obsidian', the colour due to oxidation of iron in the original magma.
Caution: Just like man-made glass, broken pieces of obsidian often have very sharp edges.
Caucasus Mountains, Georgia
Obsidian is a natural volcanic glass, formed when lava from a volcano cools extremely quickly leaving no time for crystals to grow. Amazingly, 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.
The brown and red varieties of obsidian are called 'mahogany obsidian', the colour due to oxidation of iron in the original magma.
Caution: Just like man-made glass, broken pieces of obsidian often have very sharp edges.
Click on a picture for a larger image
Size: 11 x 11 x 4 centimetres
Weight: 474 grams
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