Millosevichite
(repeating unit)Al2(SO4)3 IMA symbol Msv[1] Strunz classification 7.AB.05 Crystal system Trigonal Crystal class Rhombohedral (3)
H-M symbol: (3) Space group R3 Unit cell a = 8.05 Å, c = 21.19 Å; Z = 6 Identification Color Indigo, bright red, brick-red Crystal habit Granular aggregates of minute crystals; stalactitic porous masses Mohs scale hardness 1.5 Luster Vitreous Diaphaneity Semitransparent Specific gravity 1.72 measured Optical properties Uniaxial (+) Refractive index nω = 1.500 nε = 1.515 Birefringence δ = 0.015 Other characteristics Hygroscopic References [2][3][4]
H-M symbol: (3)
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
- ^ 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.
- ^ a b c d Handbook of Mineralogy
- ^ a b Mindat
- ^ Webmineral
- ^ Chesnokov B. V. and Shcherbakova E. P. 1991: Mineralogiya gorelykh otvalov Chelyabinskogo ugolnogo basseina – opyt mineralogii tekhnogenesa. Nauka, Moscow
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