Green Obsidian – Volcanic glass

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.
Pure obsidian is usually dark in appearance, though the color varies depending on the presence of impurities.

The obsidian in the photo is displayed at Stephen Hui Geological Museum, Hong Kong.
Credit: Stephen Hui Geological Museum

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Laura Joki, CPC said... June 12, 2014 at 6:07 PM

Not green obsidian, it's slag glass. Real green obsidian is not that tone.

Bruno Cupillard said... February 4, 2015 at 12:52 AM

I Share your opinion
I'm interested to get more one that subject .. natural side, as fake side