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Fayalite On Cristobalite

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PDM820973

Fayalite On Cristobalite

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Description
Locality: 
Inyo County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 1.2 cm
Description

Groups of brownish green crystals of fayalite in a white cristobalite matrix. They are tabular, longitudinally striated and have a great vitreous lustre. I’m told that the locality is since long in a military property, and the last pieces were recovered in the 1970’s.

Acquired in 1976 to Marion Godshaw (1915-1989).

Ex René Virlet specimen.

Mineral Data
What's on the rock

Fayalite

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

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

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Start 07 Jan 18:00
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Asia, Oceania, N-S America*, Africa
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