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Andalusite & Corundum In Muscovite

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SHS59507

Andalusite & Corundum In Muscovite

Description Tabs

Description
Locality: 
Fukushima Prefecture, Honshu Island, Japan
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.2 × 6.3 × 4.4 cm
Description

Very rare and uncommon paragenesis: red andalusite and blue corundum in muscovite

Mineral Data
What's on the rock

Andalusite

Formula: 
Al2(SiO4)O
Strunz: 
9.AF.10
Crystal System: 
Orthorhombic
Hardness: 
6.5 - 7.5
Streak: 
White
Type Locality: 
El Cardoso de la Sierra, Guadalajara, Castile-La Mancha, Spain

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
9.0
Streak: 
White

Muscovite

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