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Miguelromeroite With Pharmacosiderite

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FCM751091

Miguelromeroite With Pharmacosiderite

Rare Mineral

Description Tabs

Description
Locality: 
Veta Negra Mine, Pampa Larga, Tierra Amarilla, Copiapó Province, Atacama Region, Chile
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 2.5 × 2.5 cm
Description

Pinkish-red crystals of the rare manganese arsenate, miguelromeroite, combined with green pharmacosiderite on matrix.  

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Miguelromeroite

Formula: 
MnMn2Mn2(AsO4)2(HAsO4)2·4H2O
Strunz: 
8.CB.10
Hardness: 
0.0
Type Locality: 
Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico

Pharmacosiderite

Formula: 
KFe3+4(AsO4)3(OH)4·6-7H2O
Strunz: 
8.DK.10
Hardness: 
2.5
Streak: 
white
Type Locality: 
Carharrack Mine, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK

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