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Sewardite & Carminite

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SKY517914

Sewardite & Carminite

Rare Mineral

Description Tabs

Description
Locality: 
Sonora Copper Mine, Benjamin Hill, Benjamin Hill Municipality, Sonora, Mexico
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.8 × 1.2 cm
Description

Sharp red crystals of the intermediate member carminite-sewardite in arseniosiderite matrix. Sewardite is an extremely rare mineral only known in 4 localities worldwide.

Analyzed specimen, see copy attached in "Analysis section".
From the analysis, the theoretical formula from the EDX-result is the following:  Ca 0,08 Pb 0.10 Fe 0,42 As 0.43 so there are both phases Carminite and Sewardite with Carminite : Sewardite 55: 45 
 

Mineral Data
What's on the rock

Sewardite

Formula: 
CaFe3+2(AsO4)2(OH)2
Strunz: 
8.BH.30
Hardness: 
0.0
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

Carminite

Formula: 
PbFe3+2(AsO4)2(OH)2
Strunz: 
8.BH.30
Crystal System: 
Orthorhombic
Hardness: 
3.5
Type Locality: 
Louise Mine, Bürdenbach, Altenkirchen, Wied Iron Spar District, Westerwald, Rhineland-Palatinate, Germany
Analysis
Analysis Report - only: Sewardite & Carminite

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