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Andradite Var Melanite & Amphibole Supergroup Var Uralite

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MCH191362

Andradite Var Melanite & Amphibole Supergroup Var Uralite

ex Dr. Harry von Eckermann Collection

Description Tabs

Description
Locality: 
Gjerstad, Agder, Norway
Size Range: 
Cabinet (10-18 cm)
Size: 
10.2 × 8.1 × 5.3 cm
Largest Crystal: 
1.60cm
Description

An approx. 6 cm cavity is filled with a dozen of well formed, black melanite crystals. The matrix is a coarse, dark green amphibole rock with a bit of quartz. Out of a very old collection.

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

Uralite

Variety Of: 

Amphibole Supergroup

Formula: 
AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hardness: 
0.0
Hardness: 
0.0

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