Pilawite-(Y)
Pilawite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₂Y₂Al₄(SiO₄)₄O₂(OH)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Carminite structural group.
Key properties: Mohs hardness 5; specific gravity 4.007; White streak; Vitreous luster; optically biaxial.
IMA symbol Plw-Y, IMA status: approved, named in 2013.
Within the blocky feldspar zone of a weakly zoned and weakly fractionated NYF-affiliated granitic pegmatite dike.
It is found associated with Keiviite-(Y), gadolinite-(Y), hingganite-(Y), hellandite-(Y).
The name refers to Piława Górna, in Lower Silesia, Poland.
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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