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Sapphire & Sillimanite

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ZLT622246

Sapphire & Sillimanite

Gem Crystal

Description Tabs

Description
Locality: 
In den Dellen Quarries, Niedermendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
Class: 
Crystal Group/Cluster
Size Range: 
Micromount (under 1cm)
Size: 
0.2 × 0.2 × 0.15 cm
Description

Small cluster of sapphire crystals with some sillimannite inclusions, isolated from a sanidinite ejection block and mounted on a match stick.

Very fine gem crystal, rare for the location.

 

 

Mineral Data
What's on the rock

Sapphire

Variety Of: 

Corundum

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

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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