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Obsidian

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

 

 

 
 
TOPGEO Mineralienhandel GmbH
Dr. Petr Zajicek
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HRB 671194 Amtsgericht Ulm
VAT-Id: DE147815490
Gersbach 10
74589 Satteldorf
Germany
Telephone: +49 7950 1345
Telefax: +49 7950 8483
eMail: topgeo.gmbh@t-online.de | mail@topgeo.com
  

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