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Sillimanite

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SER605218

Sillimanite

Description Tabs

Description
Locality: 
Nibbio Mine, Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.1 × 4.5 × 4.1 cm
Largest Crystal: 
1.50cm
Description

A matrix of white pegmatite hosts some green-grey sillimanite crystals ; the largest is also well terminated

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