is not a mineral but volcanic glass formed as an extrusiv igneous rock. Obsidian is a mixture of amorphouse or cryptocrystalline grains of silica minerals formed as a result of quickly cooled lava. Petrograficaly belong the obsidian to the rhyolit-dacit family.

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Obsidian in Perlite
Superior, Pinal County, Arizona, USA

Item-No.: MIN6032
Price: 45.00 EUR 

Synonyms:  Bergmahogany, Black Lava Glass, Hyalopsite, Isophyre, Xaga
Varieties:  Fire Obsidian, Mahogany Obsidian, rainbow Obsidian, Sheen Obsidian, Snowflake Obsidian
Classification:  Igneous rock, volcanic glass, rhyolit-dacit family
Tenacity:  Brittle
Fracture:  Conchoidal
Colour:  Black, grey, green, reddisch, bluish, mahogany, golden, peacock
Lustre:  Vitreous
Transparency:  Translucent
Application:  Gemstone



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