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Natropharmacosiderite & Arseniosiderite

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PFK626632

Natropharmacosiderite & Arseniosiderite

Classic Locality

Description Tabs

Description
Locality: 
Kamariza Mines, Agios Konstantinos, Lavrion District, Attiki Prefecture, Greece
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 2.8 × 1.7 cm
Description

Excellent example of sparkling, green-brown crystals of natropharmacosiderite, associated with beige, spherical arseniosiderite. What I love on this specimen apart from the obvious rarity combination, is the weird rounded formations of the matrix (on some areas) which look like someone spilled chocolate syrup on.

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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