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Priscillagrewite-(Y), ideally (Ca 2 Y)Zr 2 Al 3 O 12  ( Ia 3̅̅ d ,  a  = 12.50 Å,  V  = 1953.13 Å 3 ,  Z  = 8), a new member of the garnet supergroup and bitikleite group, was discovered in a fluorapatite layer (meta-phosphorite) hosted by varicolored spurrite marble in the Daba- Siwaqa area of the Transjordan plateau south of Amman, central Jordan. The Daba-Siwaqa area is the largest field of the Hatrurim Complex pyrometamorphic rocks distributed along the rift of the Dead Sea. Priscillagrewite-(Y) and other accessory minerals (such as members of the brownmillerite- srebrodolskite series, fluormayenite, lakargiite, baghdadite, hematite, sphalerite, zincite, garnet of the andradite-grossular series, tululite, vapnikite, minerals of the lime-monteponite series and members of the magnesiochromite-zincochromite series, cuprite, and Y-bearing and Y-free perovskite) are distributed irregularly in varicolored spurrite marble. The empirical formula of priscillagrewite-(Y), based on 12 O atoms, isC  a    2.19Y    0.65C  e    0.03    3  +N  d    0.03    3  +G  d  d    0.02    3  +D  y    0.02    3  +$\left(\mathrm{Ca}_{2.19} \mathrm{Y}_{0.65} \mathrm{Ce}_{0.03}^{3+} \mathrm{Nd}_{0.03}^{3+} \mathrm{Gdd}_{0.02}^{3+} \mathrm{Dy}_{0.02}^{3+}\right.$E  r    0.02    3  +Yb    0.02    3  +La    0.01    3  +S  m    0.01    3  +  +Σ  3.00Z  r    1.79T  i    0.13    4  +S  b    0.07    5  +U    0.01    6  +Σ  2.00A  l    1.70F  e    1.21    3  +Si    0.04P    0.04S   +Σ  2.99O    12    .   $\left.\mathrm{Er}_{0.02}^{3+} \mathrm{Y} \mathrm{b}_{0.02}^{3+} \mathrm{L} \mathrm{a}_{0.01}^{3+} \mathrm{Sm}_{0.01}^{3++}\right)_{\Sigma 3.00}\left(\mathrm{Zr}_{1.79} \mathrm{Ti}_{0.13}^{4+} \mathrm{Sb}_{0.07}^{5+} \mathrm{U}_{0.01}^{6+}\right)_{\Sigma 2.00}\left(\mathrm{Al}_{1.70} \mathrm{Fe}_{1.21}^{3+} \mathrm{S} \mathrm{i}_{0.04} \mathrm{P}_{0.04}^{\mathrm{S}+}\right)_{\Sigma 2.99} \mathrm{O}_{12}.$    A good match was obtained for electron backscatter diffraction (EBSD) patterns with a garnet model having  a  = 12.50 Å. The new garnet forms idiomorphic, isometric crystals up to 15 μm in size. It is transparent and has pale yellowish tinge, and its luster is vitreous. Priscillagrewite-(Y) is isotropic:  n  = 1.96 based on the Gladstone-Dale calculation using  a  = 12.50 Å and the empirical formula. The Mohs hardness is about 7–7.5. Density calculated from the empirical formula is 4.48 g/cm 3 . Raman spectrum of priscillagrewite-(Y) is similar to those of other minerals of the bitikleite group and contains the following bands (cm –1 ): 150, 163, 240, 269, 289, 328, 496, 508, 726, and 785. The strongest lines of the calculated powder diffraction data are as follows [( hkl )  d hkl   ( I )]: (422) 2.552 (100), (642) 1.670 (96), (420) 2.795 (84), (400) 3.125 (72), (200) 4.419 (35), (640) 1.733 (32), and (1042) 1.141 (25). Priscillagrewite-(Y) is interpreted to be a relic of the high-temperature association formed in the progressive stage at the peak pyrometamorphism conditions when temperature could have reached close to 1000 °C.

Priscillagrewite-(Y), (Ca 2 Y)Zr 2 Al 3 O 12 : A new garnet of the bitikleite group from the Daba-Siwaqa area, the Hatrurim Complex, Jordan