Scorodite
(Redirected from Iron orthoarsenate)
| Scorodite | |
|---|---|
 | |
| General | |
| Category | Arsenate minerals |
| Formula (repeating unit) | FeAsO4·2H2O |
| IMA symbol | Scd[1] |
| Strunz classification | 8.CD.10 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pcab |
| Unit cell | a = 8.937 Å, b = 10.278 Å c = 9.996 Å; Z = 8 |
| Identification | |
| Color | Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colorless, violet |
| Fracture | Sub-conchoidal |
| Mohs scale hardness | 3.5–4 |
| Luster | Sub-adamantine, vitreous, resinous |
| Streak | Greenish-white |
| Diaphaneity | Translucent |
| Density | measured: 3.27 g/cm3 calculated: 3.276 g/cm3 |
| Optical properties | Biaxial (+) |
| Pleochroism | Weak |
| 2V angle | Measured: 40° to 75° Calculated: 46° to 80° |
| Dispersion | relatively strong r > v |
| References | [2] |
Scorodite is a common hydrated iron arsenate mineral, with the chemical formula FeAsO4·2H2O. It is found in hydrothermal deposits and as a secondary mineral in gossans worldwide. Scorodite weathers to limonite.
Scorodite was discovered in Schwarzenberg, Saxony, Germany. Named from the Greek Scorodion, "garlicky". When heated it smells of garlic, which gives it the name.
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.
- ^ http://www.mindat.org/min-3595.html Mindat data
Further reading
[edit]- Palache, C., H. Berman, and C. Frondel (1951) Dana's system of mineralogy, (7th edition), v. II, pp. 763–767
External links
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