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Natropharmacosiderite & Arseniosiderite

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PFK918217

Natropharmacosiderite & Arseniosiderite

Classic Locality

Description Tabs

Description
Locality: 
Christiana Mine, Kamariza, Agios Konstantinos, Lavrion District, Attiki Prefecture, Greece
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.4 × 5 × 4.2 cm
Description

Killer example and extremely rare combination of natropharmacosiderite with arseniosiderite on stalactitic formations of goethite. The piece is both nice and rare. The natropharmacosiderite is in the form of lustrous, gemmy, tiny little crystals and the arseniosiderite comes in spheres.

Mineral Data
What's on the rock

Natropharmacosiderite

Formula: 
(Na,K)Fe3+4(AsO4)3(OH)4·6-7H2O
Strunz: 
8.DK.10
Hardness: 
3.0
Type Locality: 
Marda oxidized zone, Koolyanobbing, Yilgarn Shire, Western Australia, Australia

Arseniosiderite

Formula: 
Ca2Fe3+3(AsO4)3O2·3H2O
Strunz: 
8.DH.30
Crystal System: 
Monoclinic
Hardness: 
4.5
Type Locality: 
Manganese deposit, Romanèche-Thorens, La Chapelle-de-Guinchay, Saône-et-Loire, Burgundy, France

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