Millosevichite

Rare sulfate mineral From Wikipedia, the free encyclopedia

Millosevichite

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.

Quick Facts General, Category ...
Millosevichite
Thumb
Porous yellow millosevichite. Dimensions: 14 mm × 10 mm × 8 mm. Locality: Kladno Mine (Nejedlý I Mine; Zdeněk Nejedlý Mine; Schoeller Mine; Schöller Mine), Libušin, Kladno, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic.
General
CategorySulfate mineral
FormulaAl2(SO4)3
IMA symbolMsv[1]
Strunz classification7.AB.05
Crystal systemTrigonal
Crystal classRhombohedral (3)
H-M symbol: (3)
Space groupR3
Unit cella = 8.05 Å, c = 21.19 Å; Z = 6
Identification
ColorIndigo, bright red, brick-red
Crystal habitGranular aggregates of minute crystals; stalactitic porous masses
Mohs scale hardness1.5
LusterVitreous
DiaphaneitySemitransparent
Specific gravity1.72 measured
Optical propertiesUniaxial (+)
Refractive indexnω = 1.500 nε = 1.515
Birefringenceδ = 0.015
Other characteristicsHygroscopic
References[2][3][4]
Close

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

Loading related searches...

Wikiwand - on

Seamless Wikipedia browsing. On steroids.