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Tridymite & Pyroxene Group

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DVE119005

Tridymite & Pyroxene Group

Ex-David J. Eicher Collection

Description Tabs

Description
Locality: 
Caspar Quarry, Bellerberg, Ettringen, Eifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 1.2 × 0.9 cm
Description

A thumbnail specimen holding tridymite with pyroxene, rare volcanic material from a classic German locality. Tridymite is a peculiar high-density form of quartz associated with volcanoes. Unusual!

Mineral Data
What's on the rock

Tridymite

Formula: 
SiO2
Strunz: 
4.DA.10
Crystal System: 
Triclinic - Pedial
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Cerro San Cristóbal, Mun. de Pachuca, Hidalgo, Mexico

Pyroxene Group

Group Members: 
Clinopyroxene Subgroup
Orthopyroxene Subgroup
David J. Eicher

Seller Information

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