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Andradite Var Melanite With Chalcedony

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CLB102578

Andradite Var Melanite With Chalcedony

Description Tabs

Description
Locality: 
Diakon Commune, Cercle de Bafoulabé, Kayes Region, Mali
Size Range: 
Cabinet (10-18 cm)
Size: 
14.2 × 7.5 × 7 cm
Largest Crystal: 
1.50cm
Description

Very good large cluster of almost black melanite crystals, held together by slightly blueish chalcedony. I've been to Kayes last year and so far have only seen one specimen of this kind. A few crystals show some damage and edge-wear but there's a good count of highly lustrous sharp-adged crystals.

Mineral Data
What's on the rock

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway

Melanite

Variety Of: 

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Hardness: 
6.5 - 7.0
Hardness: 
0.0
Colour: 
Black

Chalcedony

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Kadıköy (Chalcedon), Istanbul Province, Marmara Region, Turkey

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