Strengite is a relatively rare iron phosphate mineral with the formula: FePO4·2H2O.[5] The mineral is named after the German mineralogist Johann August Streng (1830–1897).[6] Lavender, pink or purple in hue, it is similar to variscite[7] and is partially soluble, particularly in conditions where there is a low pH and low oxidation-reduction potential.[5] The color comes from ferric ion (Fe3+).[8]
| Strengite | |
|---|---|
 A small crystal of Strengite | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | FePO4·2H2O |
| IMA symbol | Stg[1] |
| Strunz classification | 8.CD.10 |
| Dana classification | 40.04.01.02 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M Symbol: (2/m 2/m 2/m) |
| Space group | Pcab |
| Identification | |
| Formula mass | 186.85 g/mol |
| Color | Colorless, pale violet, deep violet, red, carmine red, greenish white |
| Crystal habit | Botryoidal, radial, spherical |
| Cleavage | {010} Good, {001} Poor |
| Mohs scale hardness | 3.5–4 |
| 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 | [2][3][4] |
References
edit- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ "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.
- ^ a b 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, PMID 17820817, S2CID 29895850
- ^ Senning, Alexander (2007), Elsevier's dictionary of chemoetymology: the whies and whences of chemical nomenclature and terminology, Elsevier, p. 374, ISBN 978-0-444-52239-9
- ^ Pough, Frederick H.; Peterson, Roger Tory (1997), A Field Guide to Rocks and Minerals, Peterson Field Guide, vol. 7 (5th ed.), Houghton Mifflin Harcourt, p. 239, ISBN 0-395-91096-X
- ^ "Minerals Colored by Metal Ions". minerals.gps.caltech.edu. Retrieved 2023-03-01.
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