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Iwashiroite-(Y)

A valid IMA mineral species
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Formanite-(Y),Takanawaite-(Y),Yttrotantalite-(Y)
Only one specimen found, in reddish feldspar in pegmatite.
Zoned (U-rich parts are metamict). Also known as a synthetic compound (M'-type YTaO4; Wolten, 1967).

See alsoformanite-(Y) andyttrotantalite-(Y).

The structure typically consist of TaO6 octahedra and YO8 polyhedra.



Unique Identifiers
IMA Formula:
YTaO4
Approval year:
2003
First published:
2006

Classification of Iwashiroite-(Y)
Dana 7th ed.:
8.1.2.4

Mineral Symbols
Transparency:
Translucent
Colour:
Dark red-brown, amber brown to brown
Streak:
Pale brown
Hardness:
6 onMohs scale
Cleavage:
Distinct/Good
on {010}, poor on {001}
Density:
7.1 g/cm3 (Calculated)

Optical Data of Iwashiroite-(Y)
Comments:
Refractive indices could not be measured due to the very small dimensions of the crystals and the association with a metamict substance.

Chemistry of Iwashiroite-(Y)
Common Impurities:
REE,Ti,U

Crystallography of Iwashiroite-(Y)
General Appearance of Type Material:
Aggregate of small euhedral platy crystals.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan, NSM-M28537.
Geological Setting of Type Material:
Yttrium-rich granite pegmatite.
Associated Minerals at Type Locality:
AnniteMicroclineQuartz

Synonyms of Iwashiroite-(Y)

Other Language Names for Iwashiroite-(Y)

Related Minerals -Strunz-mindat GroupingTet. 4/m :I41/a7.GA.05Fergusonite-(Ce)CeNbO4 · 0.3H2OTet.7.GA.05Fergusonite-(Nd)NdNbO47.GA.05Fergusonite-(Y)YNbO4Tet. 4/m :I41/a7.GA.05PowelliteCa(MoO4)Tet. 4/m :I41/a7.GA.05StolzitePb(WO4)Tet. 4/m :I41/a7.GA.05SuseinargiuiteNaBi(MoO4)2Tet. 4/m :I41/a7.GA.05WulfenitePb(MoO4)Tet. 4/m :I41/a7.GA.05ScheeliteCa(WO4)Tet. 4/m :I41/a7.GA.10Formanite-(Y)YTaO4Tet. 4/m :I41/a7.GA.15Paraniite-(Y)Ca2Y(AsO4)(WO4)2Tet. 4/m :I41/a7.GA.20Takanawaite-(Y)YTaO4Mon. 2/m

Fluorescence of Iwashiroite-(Y)

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    • References for Iwashiroite-(Y)ⓘSuishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama) (TL)Hori et al. (2006)
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