Strengite
From Infogalactic: the planetary knowledge core
Strengite | |
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A small crystal of Strengite
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General | |
Category | Mineral |
Formula (repeating unit) |
FePO4 · 2H2O |
Strunz classification | 8.CD.10 |
Dana classification | 40.04.01.02 |
Crystal symmetry | Orthorhombic - dipyramidal H-M Symbol (2/m 2/m 2/m) Space group: Pcab |
Identification | |
Formula mass | 186.85 g |
Color | Colorless, pale violet, deep violet, red, carmine red, greenish white |
Crystal habit | Botryoidal, radial, spherical |
Crystal system | Orthorhombic |
Cleavage | {010} Good, {001} Poor |
Mohs scale hardness | 3½ - 4 |
Luster | Vitreous |
Streak | White |
Diaphaneity | Transparent to translucent |
Specific gravity | 2.84 |
Density | 2.87 g/cm3 |
Optical properties | Biaxial (+) |
2V angle | 72° - 88° |
Dispersion | r < v, relatively strong |
References | [1][2][3] |
Strengite is a relatively rare iron phosphate mineral with the formula: FePO4 · 2H2O.[4] The mineral is named after the German mineralogist Johann August Streng (1830–1897).[5] Lavender, pink or purple in hue, it is similar to variscite[6] and is partially soluble, particularly in conditions where there is a low pH and low oxidation-reduction potential.[4]
References
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