Millosevichite

(repeating unit)Al2(SO4)3IMA symbolMsv[1]Strunz classification7.AB.05Crystal systemTrigonalCrystal classRhombohedral (3)
H-M symbol: (3)Space groupR3Unit cella = 8.05 Å, c = 21.19 Å; Z = 6IdentificationColorIndigo, bright red, brick-redCrystal habitGranular aggregates of minute crystals; stalactitic porous massesMohs scale hardness1.5LusterVitreousDiaphaneitySemitransparentSpecific gravity1.72 measuredOptical propertiesUniaxial (+)Refractive indexnω = 1.500 nε = 1.515Birefringenceδ = 0.015Other characteristicsHygroscopicReferences[2][3][4]

Millosevichite is a rare sulfate mineral with the chemical formula Al2(SO4)3.[3] Aluminium is often substituted by iron. It forms finely crystalline and often porous masses.

It was first described in 1913 for an occurrence in Grotta dell'Allume, Porto Levante, Vulcano Island, Lipari, Aeolian Islands, Sicily. It was named for Italian mineralogist Federico Millosevich (1875–1942) of the University of Rome.[2]

The mineral is mainly known from burning coal dumps, acting as one of the main minerals forming sulfate crust. It can be also found in volcanic fumeroles (solfatara environments).[2][5] It occurs with native sulfur, sal ammoniac, letovicite, alunogen and boussingaultite.[2]

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. ^ a b c d Handbook of Mineralogy
  3. ^ a b Mindat
  4. ^ Webmineral
  5. ^ Chesnokov B. V. and Shcherbakova E. P. 1991: Mineralogiya gorelykh otvalov Chelyabinskogo ugolnogo basseina – opyt mineralogii tekhnogenesa. Nauka, Moscow


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