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Sillimanite

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CAM142633

Sillimanite

Description Tabs

Description
Locality: 
Dry Creek Road, Alcova, Natrona County, Wyoming, United States of America
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.8 × 5.2 × 4.5 cm
Largest Crystal: 
3.00cm
Description

A very nice example of well-crystallized greyish white sillimanite from an occurence near Dry Creek Road in Natrona County, Wyoming, USA.

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
Cartils Minerals

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