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Sillimanite On Sapphire

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SLN645466

Sillimanite On Sapphire

Description Tabs

Description
Locality: 
Zazafotsy, Ihosy, Ihorombe, Madagascar
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
5.4 × 7.3 × 4.4 cm
Largest Crystal: 
4.00cm
Weight: 
204.00gr
Description

Aesthetic and particular specimen from Madagascar with a lot of  elongated sillimanite crystals (an uncommon silicate of Aluminum) partially covering the faces of a big perfect sapphire crystal. Sapphire is 4 X 2.4 Cm big

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

Sapphire

Variety Of: 

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Hardness: 
9.0
Formula: 
Al2O3
Hardness: 
0.0

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