Usturite
Usturite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₃(SbZr)(FeO₄)₃.
It crystallizes in the cubic crystal system (space group Ia-3d). It is a member of the Garnet structural group.
Key properties: specific gravity 4.47; White with yellow tint streak; Strong vitreous luster.
IMA symbol Ust, IMA status: approved, named in 2009.
Found in the cuspidine zone of high-temperature skarns in a carbonate-silicate xenolith at the contact with ignimbrites.
It is found associated with Cuspidine, larnite, wadalite, rondorfite, fluorite, hydroxylellestadite, ettringite group minerals, perovskite, magnesioferrite, hibschite, afwillite.
Formerly bitikleite-(ZrFe). For Ustur Mountain near the type locality.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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