Priscillagrewite-(Y)

priscillagrewite-(Y)

yttrium

phosphorite

zircon

Images

Formula: YCa₂Zr₂Al₃O₁₂
Oxide, garnet group
Specific gravity: 4.48 calculated
Hardness: 7 to 7½
Colour: Pale yellowish tinge
Environments

Sedimentary environments
Metamorphic environments

Priscillagrewite-(Y) is a new mineral, approved in 2020.

Localities

At the type locality, the Daba marble quarry, Daba, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan, the formation consists of apatite layered marble from protoliths of bituminous marls, and limestone intercalated with phosphorite.
Priscillagrewite-(Y) occurs as diomorphic (having two different forms), isometric crystals up to 15 μm in size.
It is suggested that the source material for priscillagrewite-(Y) is not from rare-earth-elementcontaining phosphatic minerals such as fluorapatite, but likely from detrital zircon as the source of both the zirconium and the yttrium (AM 107.318).

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