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Natropharmacosiderite & Arseniosiderite

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PFK628061

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: 
6.4 × 5.1 × 2 cm
Description

This is the finest and biggest example of this rarity combination that I have ever listed on e-rocks. It is quite rich with sprakling green-brown crystals of natropharmacosiderite and spherical arseniosiderite! As few pieces of this find did, some areas of the matrix show rounded formations with dark brown spills of something that looks like chocolate syrup, I do not know what the mineral is but it is funny!

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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