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Illite Psm Cordierite

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PDM586567

Illite Psm Cordierite

Pseudomorph

Description Tabs

Description
Locality: 
Menat Mine, Menat, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.3 × 3.8 × 3 cm
Largest Crystal: 
1.10cm
Description

Prismatic crystal of cordierite replaced by a mix of clay minerals (type illite) known as “pinite”, on a porphyry matrix. It is from the classic French locality at the Puy-de-Dôme (Auvergne).

Ex. C. Mathé 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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