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Illite Psm Cordierite

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PDM722896

Illite Psm Cordierite

Pseudomorph

Description Tabs

Description
Locality: 
Pauliberg, Zwiesel, Lower Bavaria, Bavaria, Germany
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.7 × 5 × 4.8 cm
Largest Crystal: 
2.00cm
Description

Prismatic crystal of cordierite replaced by a mix of phyllosilicates, mainly clay minerals (type illite), known as “pinite”, on a quartz matrix. Rare locality specimen from Pauliberg.

Found in 2006, it comes with a label of Florian Wrobel, specimen #4503.

Previous labels supplied (not photographed)
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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