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Sillimanite

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WND836944

Sillimanite

Description Tabs

Description
Locality: 
Willimantic, Windham, Windham County, Connecticut, United States of America
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
10.7 × 6.6 × 2.5 cm
Description

Several elongated crystals of Sillimanite perched on and embedded in matrix. The crystals are well developed, almost sharp and lustrous. The lucent crystals are showing an olive-brown colour. An unusual specimen.

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
Wendel Minerals

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