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Giniite Phosphosiderite Robertsite & Heterosite

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POL897854

Giniite Phosphosiderite Robertsite & Heterosite

Type Locality

Description Tabs

Description
Locality: 
Sandamap Pegmatite, Sandamap North Farm 115, Dâures, Erongo Region, Namibia
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.2 × 3.4 × 2 cm
Description

Very nice and rich sample of very rare (three locations only) black Giniite with blue Phosphosiderite, brown Robertsite and purple Heterosite on matrix from Sandamap pegmatite in Namibia - Type Locality for Giniite! Minor pale green Tavorite is also present.

Mineral Data
What's on the rock

Giniite

Formula: 
Fe2+Fe3+4(PO4)3(OH)5·2H2O
Strunz: 
8.DB.50
Hardness: 
3.0 - 4.0
Type Locality: 
Sandamap pegmatite (Sandamab pegmatite), Sandamap North Farm 115 (Sandamab), Usakos, Karibib District, Erongo Region, Namibia

Phosphosiderite

Formula: 
FePO4·2H2O
Strunz: 
8.CD.05
Hardness: 
3.5 - 4.0
Type Locality: 
Kalterborn Mine, Eiserfeld, Siegerland, North Rhine-Westphalia, Germany

Robertsite

Formula: 
Ca3Mn3+4(PO4)3O2·3H2O
Strunz: 
8.DH.30
Hardness: 
3.5
Streak: 
Red-brown
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Heterosite

Formula: 
(Fe3+,Mn3+)PO4
Strunz: 
8.AB.10
Hardness: 
4.0 - 4.5
Type Locality: 
Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin, France

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