A lot of small black single crystals of the very rare K-Ti oxide mineral priderite from the type locality in Australia: Walgidee Hills, Noonkanbak, Western Australia. — Photo: David Hospital · CC BY-SA 4.0
Priderite
Priderite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula K(Ti₇Fe³⁺)O₁₆.
It crystallizes in the tetragonal crystal system (space group I4/m). It is a member of the Coronadite structural group.
Key properties: specific gravity 3.86; Gray streak; Adamantine luster; optically uniaxial.
IMA symbol Pdr, grandfathered status — known before the IMA’s founding, named in 1951.
Found in some ultrapotassic lamproites, ultramafics, and carbonatites.
It is found associated with Leucite, potassian richterite, titanian phlogopite, jeppeite, shcherbakovite, wadeite, perovskite, apatite (West Kimberley area, Australia).
The name refers to Rex Tregilgas Prider (1910–), Professor of Geology, University of Western Australia, Perth, Australia, who provided the first pure sample of the species.