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Giniite Phosphosiderite & Robertsite

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POL894289

Giniite Phosphosiderite & Robertsite

Type Locality

Description Tabs

Description
Locality: 
Sandamap Pegmatite, Sandamap North Farm 115, Dâures, Erongo Region, Namibia
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.6 × 1.4 cm
Description

Very nice and rich sample of very rare (three locations only) black Giniite with blue Phosphosiderite on matrix (Quartz and weathered Heterosite) with some minor brown Robertsite and pale green Tavorite from Sandamap pegmatite in Namibia - Type Locality for Giniite!

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

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