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Annabergite Cabrerite Calcite Ankerite & Psilomelane

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AST204703

Annabergite Cabrerite Calcite Ankerite & Psilomelane

Description Tabs

Description
Locality: 
Km-3 Mine, Lavrion District, Attiki Prefecture, Greece
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 4 × 3.5 cm
Description

Intense dark green annabergite crystals with neon green cabrerite, brown scalenoedral calcite and rhomboedral ankerite in matrix cavity. Crusts of black psilomelane are also present.

Mineral Data
What's on the rock

Annabergite

Formula: 
Ni3(AsO4)2·8H2O
Strunz: 
8.CE.40
Crystal System: 
Monoclinic
Hardness: 
1.5 - 2.5
Type Locality: 
Teichgräber Flacher vein, Teichgräber deep adit, Kippenhain Mine (Kippenhayn Mine), Schreckenberg, Frohnau, Annaberg-Buchholz, Annaberg District, Erzgebirge, Saxony, Germany

Cabrerite

Synonym Of: 

Magnesian Annabergite

Formula: 
(Ni,Mg)3(AsO4)2·8H2O
Hardness: 
0.0

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Ankerite

Formula: 
Ca(Fe2+,Mg)(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Styrian Erzberg, Eisenerz, Styria, Austria