Black icometric crystals of the rare mineral kimzeyite associated to octahedral black magnetite. From: Magnet Cove, Hot Spring County, Arkansas, United States of America. — Photo: David Hospital · CC BY-SA 4.0
Kimzeyite
Kimzeyite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₃Zr₂(SiAl₂)O₁₂.
It crystallizes in the cubic crystal system (space group Ia-3d). It is a member of the Garnet structural group.
Key properties: Mohs hardness 7; specific gravity 4; Light brown streak; Vitreous luster.
IMA symbol Kmz, IMA status: approved, named in 1961.
Found in a carbonatite in association with ijolite (Magnet Cove, Arkansas, USA); in a shoshonitic basaltic lava (Stromboli, Italy).
It is found associated with Apatite, calcite, monticellite, magnetite, perovskite, anhydrite, vesuvianite, biotite, pyrite (Magnet Cove, Arkansas, USA).
The name refers to Joe Kimzey, the mineral's discoverer, and the Kimzey family, of Magnet Cove, Arkansas, USA.