Iwashiroite-(Y)
Iwashiroite-(Y) is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula YTaO₄.
It crystallizes in the monoclinic crystal system (space group P2/a).
Key properties: Mohs hardness 6; specific gravity 7.135; Pale brown streak; Vitreous to sub-adamantine luster.
IMA symbol Iwa-Y, IMA status: approved, named in 2003.
Found in an NYF-type granitic pegmatite.
It is found associated with Quartz, microcline, annite.
The name comes from Iwashiro, the old provincial name for the central part of Fukushima Prefecture, and the dominant rare earth element, Yittrium.
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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