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Cristobalite & Fayalite

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CFL695056

Cristobalite & Fayalite

Description Tabs

Description
Locality: 
Siskiyou County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 5.5 × 4.5 cm
Weight: 
150.00gr
Description

Very nice and typical obsidian specimen with cristobalite and fayalite vesicles.  Ex-Don Davis specimen.  Possibly collected by Don Davis.

Mineral Data
What's on the rock

Cristobalite

Formula: 
SiO2
Strunz: 
4.DA.15
Crystal System: 
Tetragonal - Trapezohedral
Hardness: 
6.0 - 7.0
Streak: 
White
Type Locality: 
Cerro San Cristóbal, Mun. de Pachuca, Hidalgo, Mexico

Fayalite

Formula: 
Fe2+2SiO4
Strunz: 
9.AC.05
Crystal System: 
Orthorhombic
Hardness: 
7.0
Type Locality: 
Faial Island (Fayal Island), Azores District, Portugal

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