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Pharmacosiderite Scorodite & Jarosite

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BCK684458

Pharmacosiderite Scorodite & Jarosite

David Burgess Collection

Description Tabs

Description
Locality: 
Richmond-Sitting Bull Mine, Galena, Lawrence County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.1 × 5.1 × 4 cm
Description

You are bidding on a large, vuggy sample with green cubes, some quite elongated, of pharmacosiderite with clusters of scorodite and rich jarosite crystals. There are also abundant gypsum crystals. Very rare material from this unusual arsenate-bearing mine in South Dakota. David Burgess collection. 

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

Scorodite

Formula: 
Fe3+AsO4·2H2O
Strunz: 
8.CD.10
Crystal System: 
Orthorhombic
Hardness: 
3.5 - 4.0
Type Locality: 
Stamm Asser Mine, Graul, Langenberg, Schwarzenberg District, Erzgebirge, Saxony, Germany

Jarosite

Formula: 
KFe3+ 3(SO4)2(OH)6
Strunz: 
7.BC.10
Crystal System: 
Trigonal - Pyramidal Class
Hardness: 
2.5 - 3.5
Type Locality: 
Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora (Cuevas de Vera), Almería, Andalusia, Spain

Seller Information

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