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Sillimanite

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CFL686967

Sillimanite

Description Tabs

Description
Locality: 
Benson Mines, Benson, Star Lake, St Lawrence County, New York, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2 × 0.7 cm
Weight: 
20.00gr
Description

Representative specimen of acicular sillimanite crystals in matrix.

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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