Dark orange crystals of the new and extremely rare mineral giacovazzoite mineral. According to one of the authours, the find was strictly limited to a very small area of about 0,5 m long inside the Arsiccio mine (Monte Arsiccio Mine, Apuan Alps, Tuscany, Italy). — Photo: David Hospital · CC BY-SA 4.0
Giacovazzoite
Giacovazzoite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₅Fe³⁺₃O(SO₄)₆·10H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 2; specific gravity 2.392; Yellowish streak; Vitreous luster.
IMA symbol Gvz, IMA status: approved, named in 2019.
Secondary in a weathered, Tl-rich, pyrite-baryte-magnetite-hematite deposit.
It is found associated with Alum-(K), gypsum, krausite, magnanelliite, scordariite.
The mineral was named to honor Carmelo Giacovazzo (b. 1940), retired Professor of Mineralogy and Crystallography, University of Bari, Italy, for his contributions to crystallography.