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Mullite Topaz Cordierite

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SMM755255

Mullite Topaz Cordierite

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Description
Locality: 
Emmelberg, Üdersdorf, Daun, Eifel, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1.2 × 0.7 cm
Description

Many, crystals tufts of white mullite, colorless, divergent, topaz crystals groups and brownish, flat crystals of cordierite spread on the volcanic matrix, together there are prismatic dark-brown pseudobrookite crystals.

Boxed with Label
Mineral Data
What's on the rock

Mullite

Formula: 
Al4+2xSi2-2xO10-x
Strunz: 
9.AF.20
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 7.0
Type Locality: 
Seabank Villa, Isle of Mull, Strathclyde (Argyllshire), Scotland, UK

Topaz

Formula: 
Al2(SiO4)(F,OH)2
Strunz: 
9.AF.35
Crystal System: 
Orthorhombic - Dipyramidal
Hardness: 
8.0
Streak: 
White

Cordierite

Formula: 
(Mg,Fe)2Al3(AlSi5O18)
Strunz: 
9.CJ.10
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 7.5
Type Locality: 
Großer Arber, Bayerisch Eisenstein, Lower Bavaria, Bavaria, Germany

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