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Illite Psm Cordierite

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PDM613220

Illite Psm Cordierite

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Description
Locality: 
Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.2 × 1 cm
Description

Prismatic crystal of cordierite replaced by a mix of clay minerals (type illite) known as “pinite”. It is from the classic French locality at the Puy-de-Dôme (Auvergne). It is formed by {100}, {110}, {130} and {001}. Only one end is complete.

Acquired in 1973, it is an Ex. Gerard Vogel specimen.

Mineral Data
What's on the rock

Illite

Variety Of: 

Muscovite

Formula: 
KAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Hardness: 
2.5
Formula: 
K0.65Al2.0[Al0.65Si3.35O10](OH)2
Hardness: 
1.0 - 2.0
Streak: 
White
Type Locality: 
Maquoketa Shale, Gilead, Calhoun Co., Illinois, USA

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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