Outstanding white crystals of the extremely rare Mn sulphate mineral chvaleticeite from the TL in Chvaletice, Czech Republic. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Chvaleticeite
A monoclinic manganese-magnesium sulfate hexahydrate forming in the oxidized zones of metamorphosed manganese deposits.
Intro adapted from Wikipedia (CC BY-SA).
Chvaleticeite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Mn(SO₄)·6H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Hexahydrite structural group.
Key properties: Mohs hardness 1.5; specific gravity 1.84; Vitreous luster.
IMA symbol Cva, IMA status: approved, named in 1984.
Formed in the oxidation zone of a pyrite–manganese silicate deposit (Chvaletice, Czech Republic).
It is found associated with Melanterite, magnesian–manganoan melanterite, epsomite, magnesian–ferroan mallardite, magnesian jokokuite, magnesian ilesite, rozenite, copiapite.
The name is derived from the locality where the first specimens were collected, Chvaletice, Czech Republic.