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Mineralpedia Details for Phosphosiderite

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Phosphosiderite

Phosphosiderite

The composition of Phosphosiderite is its namesake after phosphorous and the Greek word for “iron,” sidero. Phosphosiderite can be found in small amounts at many localities including Germany, France, Portugal, Sweden, Liberia, South Africa, Mozambique, the United States including here in the Black Hills of South Dakota in the Bull Moose mine, Canada, Brazil, and Argentina. Phosphosiderite forms as “an alteration product of triphylite in zoned complex granite pegmatites” and can also be a soil constituent as well as a replacement mineral in bones and shells.

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

Formula
Fe3+PO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Spherical 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, purple, pink, red, red violet 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
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Phosphosiderite from Stewart mine, Pala dist., San Diego Co., California, United States

Phosphosiderite
            from Stewart mine, Pala dist., San Diego Co., California, United States

Decayed phosphate pod with strikingly purple secondary Phosphosiderite lining the core.

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Phosphosiderite from Bull Moose mine, Custer Co., South Dakota, United States

Phosphosiderite
            from Bull Moose mine, Custer Co., South Dakota, United States

Raspberry red, flat prismatic, striated micro crystals as singles throughout the matrix occuring in Wicksite vugs in primary(?) phosphate Barbosalite and Pyrite. 

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