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Sillimanite & Prismatine

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RMM95405

Sillimanite & Prismatine

Description Tabs

Description
Locality: 
Hincks Bridge, Lac-Sainte-Maire, Outaouais, Québec, Canada
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3 × 1 cm
Largest Crystal: 
1.00cm
Description

Needles of clear sillimanite to 1.0 cm in a 1.0 mm thick layer of sillimanite on a piece of paragneiss which contains prismatine crystals.

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

Prismatine

Formula: 
([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
Strunz: 
9.BJ.50
Crystal System: 
Orthorhombic
Hardness: 
6.5 - 7.0
Type Locality: 
Granulite outcrop, Waldheim, Döbeln, Saxony, Germany

Seller Information

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