Priscillagrewite-(Y), ideally (Ca2Y)Zr2Al3O12 (Ia3d, a = 12.50 Å, V = 1953.13 Å3, Z = 8), a new member of the garnet supergroup and bitikleite group, was discovered in a fluorapatite layer (metaphosphorite) 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, is (Ca2.19Y0.65Ce0.033+Nd0.033+Gd0.023+Dy0.023+Er0.023+Yb0.023+La0.013+Sm0.013+⁠)Σ3.00(Zr1.79Ti0.134+Sb0.075+U0.016+⁠)Σ2.00(Al1.70Fe1.213+Si0.04P0.045+⁠)Σ2.99O12. 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/cm3. 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) dhkl (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.

中文翻译：

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Priscillagrewite-（Y），（Ca2Y）Zr2Al3O12：来自约旦哈特里姆综合体Daba-Siwaqa地区的bitikleite族的新石榴石

在石榴石的萤石层（偏亚磷灰石）中发现了石榴石超晶石（Y），理想的是（Ca2Y）Zr2Al3O12（Ia3d，a = 12.50Å，V = 1953.13Å3，Z = 8）由约旦中部安曼以南的Transjordan高原Daba-Siwaqa地区的杂色绢云母大理石制成。Daba-Siwaqa地区是沿死海裂谷分布的Hatrurim复杂火山形岩石的最大区域。角闪石-（Y）和其他辅助矿物（例如褐闪石-亚闪石系列的成员，萤石，闪锌矿，钙长石，巴格达石，赤铁矿，闪锌矿，锌矿，石榴石和辐射-粗陶系列，白云母，白云母，石灰-蒙脱石矿物镁铬铁矿-锌铬铁矿系列，铜铁矿的系列和成员，（含Y和不含Y的钙钛矿）不规则地分布在杂色的亚硫酸盐大理石中。以12个O原子为基础的菱镁石-（Y）的经验公式为（Ca2.19Y0.65Ce0.033 + Nd0.033 + Gd0.023 + Dy0.023 + Er0.023 + Yb0.023 + La0.013 + Sm0.013 +⁠）Σ3.00（Zr1.79Ti0.134 + Sb0.075 + U0.016 +⁠）Σ2.00（Al1.70Fe1.213 + Si0.04P0.045 +⁠）Σ2.99O12。电子背散射衍射（EBSD）模式与石榴石模型的a = 12.50Å匹配良好。新的石榴石可形成尺寸最大为15μm的独特的等距晶体。它是透明的，具有淡黄色调，其光泽是玻璃态的。菱镁矿-（Y）是各向同性的：基于使用= 12.50Å的Gladstone-Dale计算和经验公式，n = 1.96。莫氏硬度约为7–7.5。根据经验公式计算出的密度为4.48 g / cm3。钠长晶石-（Y）的拉曼光谱与二元锂族的其他矿物的拉曼光谱相似，并包含以下谱带（cm-1）：150、163、240、269、289、328、496、508、726和785。 。计算出的粉末衍射数据的最强线如下[（hkl）dhkl（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）和（1042）1.141（25）。闪锌矿-（Y）被认为是高温峰形条件下在渐进阶段形成的高温缔合的产物，当时温度可能已接近1000°C。计算出的粉末衍射数据的最强线如下[（hkl）dhkl（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）和（1042）1.141（25）。闪锌矿-（Y）被认为是高温峰形条件下在渐进阶段形成的高温缔合的产物，当时温度可能已接近1000°C。计算出的粉末衍射数据的最强线如下[（hkl）dhkl（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）和（1042）1.141（25）。闪锌矿-（Y）被认为是高温峰形条件下在渐进阶段形成的高温缔合的产物，当时温度可能已接近1000°C。