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Pharmacosiderite & Arthurite

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BCK720298

Pharmacosiderite & Arthurite

Martin Jensen collection
Classic Locality

Description Tabs

Description
Locality: 
Majuba Hill Mine, Antelope, Pershing County, Nevada, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.2 × 2.4 × 1.8 cm
Description

You are bidding on a beautiful thumbnail from the Martin Jensen collection with dozens and dozens of very sharp, transparent color-changing pharmacosiderite crystals on a fracture with tourmaline, quartz and small sprays of apple-green arthurite. The pharmacosiderite crystals appear blue in the photos, but are actually a very nice bottle green color in natural light. These are some of the strongest color-change crystals I've seen. Very aesthetic micro begging for some nice photos!

Mineral Data
What's on the rock

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

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

Seller Information

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