| Mineral | Phosphosiderite |
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| Formula | FePO4 ยท 2H2O |
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| Crystal Form | Monoclinic/Prismatic [2/m] |
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| Cleavage | Good on {010}; Indistinct on {001} |
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| Color | Purple to reddish violet, rose-red, peachy-pink, brownish yellow, moss-green, colorless |
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| Density | 2.7 – 2.8 g/cm3 |
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| Diaphaneity | Transparent, Translucent |
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| Fracture | Irregular, Brittle |
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| Hardness | 3.5 - 4.0 |
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| Lustre | Vitreous, Resinous |
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| Type Loc. | Kalterborn Mine, Eiserfeld, Siegen, Siegen-Wittgenstein, Arnsberg, N. Rhine-Westphalia, Germany |
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| Dana 8 Class | 40.4.3.2 |
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| Strunz Class | 8.CD.05 |
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| Mindat | mindat.org |
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| WebMineral | WebMineral |
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| ID | 475 |
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