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Illite Psm Cordierite

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PDM805047

Illite Psm Cordierite

Pseudomorph

Description Tabs

Description
Locality: 
Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 3.5 × 3.3 cm
Largest Crystal: 
1.20cm
Description

Prismatic crystal of cordierite replaced by a mix of clay minerals (type illite) known as “pinite”, in a matrix of altered pink granite of coarse grain. It is not from the classic localities at the Puy-de-Dôme (Auvergne), but from a small outcrop located in private terrain. The exact locality will be given to the buyer.

Found in 05/2016 by Cyriel Matthé with permission of the terrain owner.

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

Seller Information

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