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Sillimanite

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BSR540156

Sillimanite

Classic Locality

Description Tabs

Description
Locality: 
Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 9.5 × 4 cm
Description

Prismatic veins of grey sillimanite on matrix from a classic locality. It's difficult to find crystals of this species.

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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