Monthly Archives May 2009

Obsidian – A stone for grounding and carving

Obsidian is a type of volcanic glass that forms from lava flows. Like silica glass, it can be fashioned into sharp blades or carved into beautiful sculptures, but the hardness is only about 5 on the Mohs scale (so it isn’t durable). If not polished properly, it may be hazardous to handle obsidian because the sharp edges can cut the skin easily. Obsidian is not considered a true mineral because it does not crystallize in any form whatsoever. It’s chemical composition is pretty complicated too but includes a high proportion of silica content (SiO2).
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