Black versilianite associated to sharp cubic black crystals of apuanite, from the type and only known locality for both worldwide: Buca Della Vena Mine, Apuan Alps, Lucca Province, Tuscany, Italy. — Photo: David Hospital · CC BY-SA 4.0
Versiliaite
Versiliaite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula (Fe²⁺₂Fe³⁺₂)(Fe³⁺₂Sb³⁺₆)O₁₆S.
It crystallizes in the orthorhombic crystal system (space group Pbam).
Key properties: specific gravity 5.12; Metallic luster.
IMA symbol Vsl, IMA status: approved, named in 1978.
Found in an iron ore deposit in barite formed by metasomatic processes at the contact between phyllites and dolostones.
It is found associated with Schafarzikite, apuanite, derbylite, barite, magnetite, hematite, pyrite.
The name refers to the Versilia Valley, Apuan Alps, Italy, where it was found.