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Mineralpedia Details for Arseniosiderite

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Arseniosiderite

Arseniosiderite

Named for the composition of arsenic and iron after the Greek word for “iron,” sideros. Arseniosiderite is an uncommon mineral that forms as a secondary mineral via the oxidization of early arsenic minerals, usually scorodite and/or arsenopyrite. Localities for Arseniosiderite include in France, Austria, Germany, England, Greece, Namibia, the United States, Mexico, Bolivia, and Australia, among several others. Associated minerals include beudantite, carminite, scorodite, dussertite, pharmacolite, pitticite, adamite, erythrite, arsenopyrite, and lollingite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/arseniosiderite.pdf

Formula
Ca2Fe3+3O2(AsO4)3·3H2
Crystal System
Monoclinic 
Crystal Habit
Fibrous 
Cleavage
Good, None, None 
Luster
Sub Metallic 
Color
bronze brown, yellow, yellow brown, dark brown, black 
Streak
ochraceous 
Class
Monoclinic - Prismatic 
Hardness
1.5 
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Arseniosiderite from Romanèche-Thorens, Saône-et-Loire, Burgundy, France

Arseniosiderite
            from Romanèche-Thorens, Saône-et-Loire, Burgundy, France

Orange brown compact fibrous Arseniosiderite from the type locality.

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