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Arthurite & Pharmacosiderite

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BCK719079

Arthurite & Pharmacosiderite

Martin Jensen collection
Rare Mineral

Description Tabs

Description
Locality: 
Mammoth Mine, Tintic District, Juab County, Utah, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.4 × 2.5 × 1.6 cm
Description

You are bidding on a thumbnail specimen with a few small aggregates of arthurite crystals in vugs with scattered small pharmacosiderite cubes. Arthurite is very rare at this locality! Collected by Joe Marty and given to Martin Jensen in 1992. 

Mineral Data
What's on the rock

Arthurite

Formula: 
CuFe3+2(AsO4)2(OH)2·4H2O
Strunz: 
8.DC.15
Crystal System: 
Orthorhombic
Hardness: 
3.0 - 4.0
Type Locality: 
Hingston Down Consols, Clitters United Mines, Gunnislake, Calstock, Callington District, Cornwall, England, UK

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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