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Cristobalite Tridymite Orthopyroxene Subgroup

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ZLT719717

Cristobalite Tridymite Orthopyroxene Subgroup

Description Tabs

Description
Locality: 
Bellerberg, Ettringen, Eifel Mountains, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
1.2 × 3.3 × 1.9 cm
Description

Part of a quartz rich xenolith with some octahedrons of cristobalite (~1 mm); tridimite and orthopyroxene.

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

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

Orthopyroxene Subgroup

Group Members: 
Donpeacorite
Enstatite
Ferrosilite
Enstatite-Ferrosilite Series
Group Parent: 
Pyroxene Group

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