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Muscovite Var Illite Psm Leucite

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UVM846168

Muscovite Var Illite Psm Leucite

Pseudomorph

Description Tabs

Description
Locality: 
Kalehöyük, Kaman, Kırşehir Province, Turkey
Class: 
Single Crystal
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 6 × 5 cm
Description

A sharp single crystal of leucite replaced by Muscovite var. Illite.   This is how the specimen was labeled from Minresco, but it is more common to see these labeled as orthoclase after leucite.   Either way, a fine pseudomorph.

Mineral Data
What's on the rock

Muscovite

Formula: 
KAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Hardness: 
2.5
Streak: 
White

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

Leucite

Formula: 
K(AlSi2O6)
Strunz: 
9.GB.05
Hardness: 
5.5 - 6.0
Type Locality: 
Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy

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