Kintoreite Field of view: 1 mm Locality: Serra da Mina Mine, Cercal do Alentejo, Santiago do Cacém, Setúbal, Portugal Description: Collection & Photograph Christian Rewitzer 5.2021 Collected March 2013 SEM-EDS and XRD analyzed. — Photo: Christian Rewitzer · CC BY-SA 3.0
Kintoreite
Kintoreite is an IMA-recognized mineral species in the phosphate class, with the chemical formula PbFe³⁺₃(PO₄)(PO₃OH)(OH)₆.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Alunite-crandallite structural group.
Key properties: Mohs hardness 4; specific gravity 4.2; Pale yellowish green streak; Vitreous to adamantine (crystals); greasy to waxy (aggregates) luster; optically uniaxial.
IMA symbol Kt, IMA status: approved, named in 1992.
A rare secondary mineral found in the oxidized zone of a Pb–Zn deposit.
It is found associated with Segnitite, pyromorphite, mimetite, libethenite, hinsdalite, rockbridgeite–dufrénite, apatite, goethite.
The name refers to the site from which the best specimens were first collected, the Kintore open cut, Broken Hill, Australia.