Scorodite

Hydrated iron arsenate mineral
(repeating unit)FeAsO4·2H2OIMA symbolScd[1]Strunz classification8.CD.10Crystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupPcabUnit cella = 8.937 Å, b = 10.278 Å
c = 9.996 Å; Z = 8IdentificationColorGreen, blue-green, grey, grayish-green, blue, yellow-brown, nearly colorless, violetFractureSub-conchoidalMohs scale hardness3.5–4LusterSub-adamantine, vitreous, resinousStreakGreenish-whiteDiaphaneityTranslucentDensitymeasured: 3.27 g/cm3 calculated: 3.276 g/cm3Optical propertiesBiaxial (+)PleochroismWeak2V angleMeasured: 40° to 75° Calculated: 46° to 80°Dispersionrelatively strong r > vReferences[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

  1. ^ 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.
  2. ^ http://www.mindat.org/min-3595.html Mindat data

Further reading

  • 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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