IMA 2020-002 = priscillagrewite-(Y)

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Marco E. Ciriotti
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IMA 2020-002 = priscillagrewite-(Y)

Messaggio da Marco E. Ciriotti » mer 02 set, 2020 20:55

Prossima pubblicazione.

Referenza:
▪ Galuskina, I., Galuskin, E., Vapnik, Y., Zeliński, G., Prusik, K. (2021): Priscillagrewite-(Y), (Ca2Y)Zr2Al3O12 - a new garnet of the bitikleite group from the Daba- Siwaqa area, the Hatrurim Complex, Jordan. American Mineralogist, 106, (in press).
Marco E. Ciriotti

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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Re: IMA 2020-002 = priscillagrewite-(Y)

Messaggio da Marco E. Ciriotti » gio 03 set, 2020 18:06

Bitikleite group in the garnet supergroup.

Bitikleite {Ca3}[Sb5+Sn4+](Al3)O12
Dzhuluite {Ca3}[Sb5+Sn4+](Fe3+3)O12
Elbrusite {Ca3}[U6+0.5Zr1.5](Fe3+3)O12
Priscillagrewite-(Y) {YCa2}[Zr2](Al3)O12
Usturite {Ca3}[Sb5+Zr](Fe3+3)O12
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2020-002 = priscillagrewite-(Y)

Messaggio da Marco E. Ciriotti » dom 04 apr, 2021 11:43

Pubblicazione effettuata.

Referenza:
▪ Galuskina, I., Galuskin, E., Vapnik, Y., Zeliński, G., Prusik, K. (2021): Priscillagrewite-(Y), (Ca2Y)Zr2Al3O12 - a new garnet of the bitikleite group from the Daba- Siwaqa area, the Hatrurim Complex, Jordan. American Mineralogist, 106, 641-649.

Abstract:
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.
Marco E. Ciriotti

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