Godovikovite

Sulfate mineral
(repeating unit)(NH4)(Al,Fe+3)(SO4)2IMA symbolGod[1]Strunz classification07.AC.20(07)Dana classification28.03.05.02Crystal systemTrigonalCrystal classTrapezohedralSpace groupTrigonal enantiomorphUnit cella = 4.75Å, c = 8.30(1)ÅIdentificationFormula mass244.36ColourWhite, colourlessCrystal habitVery small hexagonal bladesFractureUnevenMohs scale hardness2LusterEarthy/dullStreakWhiteDiaphaneityTransparent to translucentDensity2.53Birefringence0.009SolubilitySlowly in H2O

Godovikovite is a rare sulfate mineral with the chemical formula: (NH4)Al(SO4)2. Aluminium can partially be substituted by iron. Hydration of godovikovite gives the ammonium alum, tschermigite. The mineral forms cryptocrystalline, often porous, masses, usually of white colour. Single crystals are very small hexagonal blades. Typical environment for godovikovite are burning coal sites (mainly dumps).[2] There the mineral acts, together with millosevichite, as one of the main components of so-called sulfate crust.[3][4]

It was first described in 1988 for an occurrence in the Chelyabinsk coal basin, Chelyabinsk Oblast, Southern Urals, Russia, and named for Russian mineralogist Aleksandrovich Godovikov (1927–1995).[5]

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. ^ "Godovikovite" (PDF). Handbook of Mineralogy. Retrieved 15 February 2021.
  3. ^ Chesnokov B. V. and Shcherbakova E. P. 1991: Mineralogiya gorelykh otvalov Chelyabinskogo ugolnogo basseina - opyt mineralogii tekhnogenesa. Nauka, Moscow
  4. ^ Jambor J. L. and Grew E. S. 1990: New mineral names. American Mineralogist, 76, pp. 240-246
  5. ^ Godovikovite on Mindat.org
  • Webmineral


  • v
  • t
  • e