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Sillimanite

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SER123156

Sillimanite

Description Tabs

Description
Locality: 
Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.1 × 7.1 × 4.1 cm
Largest Crystal: 
5.30cm
Description

a large grey crystal on pegmatite

Mineral Data
What's on the rock

Sillimanite

Formula: 
Al2(SiO4)O
Strunz: 
9.AF.05
Crystal System: 
Orthorhombic
Hardness: 
6.5 - 7.5
Streak: 
white
Type Locality: 
Chester, Middlesex Co., Connecticut, USA
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