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Sillimanite

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GFM745175

Sillimanite

Description Tabs

Description
Locality: 
Coronel Murta, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 2.1 × 1.2 cm
Description

pale brownish 3 cm (KS) to 4 cm (NS) "apricot kernel" aggregates of fibrous Sillimanite. These "Seed-l[ke" aggregates are found in the Lateritic zone above a Granulite. I have never seen or heard of anything like this

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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