Strengite
Strengite | |
---|---|
A small crystal of Strengite | |
General | |
Category | Mineral |
Formula (repeating unit) | FePO4 · 2H2O |
Strunz classification | 08.CD.10 |
Dana classification | 40.04.01.02 |
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 | g/cm3 2.87 |
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
- ↑ "Strengite Mineral Data". Webmineral.com. Retrieved 2011-10-25.
- ↑ "Strengite mineral information and data". Mindat.org. Retrieved 2011-10-25.
- ↑ "STRENGITE (Hydrated Iron Phosphate)". Retrieved 2011-10-25.
- 1 2 Patrick, W. H., Jr.; Gotoh, S.; Williams, B. G. (February 9, 1973), "Strengite Dissolution in Flooded Soils and Sediments", Science 179 (4073): 564–565, Bibcode:1973Sci...179..564P, doi:10.1126/science.179.4073.564
- ↑ Senning, Alexander (2007), Elsevier's dictionary of chemoetymology: the whies and whences of chemical nomenclature and terminology, Elsevier, p. 374, ISBN 0-444-52239-5
- ↑ Pough, Frederick H.; Peterson, Roger Tory (1997), A Field Guide to Rocks and Minerals, Peterson Field Guide 7 (5th ed.), Houghton Mifflin Harcourt, p. 239, ISBN 0-395-91096-X
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