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Illite

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ESM825067

Illite

Description Tabs

Description
Locality: 
Petersberg Quarry, Halle, Saxony - Anhalt, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1 × 0.5 cm
Description

Lustrous green illite crystals on matrix  ( For original close-up photo contact us )

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