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Pilawite-(Y), Ca2(Y,Yb)2[Al4(SiO4)4O2(OH)2], a new mineral from the Piława Górna granitic pegmatite, southwestern Poland: mineralogical data, crystal structure and association

  • Adam Pieczka (a1), Frank C. Hawthorne (a2), Mark A. Cooper (a2), Eligiusz Szełęg (a3), Adam Szuszkiewicz (a4), Krzysztof Turniak (a4), Krzysztof Nejbert (a5) and Sławomir Ilnicki (a5)...

Pilawite-(Y), ideally Ca2(Y,Yb)2Al4(SiO4)4O2(OH)2, was discovered in a pegmatite near Piława Górna, Lower Silesia, Poland. The mineral occurs as white, translucent, brittle crystals up to 1.5 mm in size. It has a white streak, vitreous lustre and a hardness of 5 on Mohs scale. The calculated density is 4.007 g/cm3. Pilawite-(Y) is non-pleochroic, biaxial (+), with refractive indices α = 1.743(5), β = 1.754(5) and γ = 1.779(5), birefringence Δ = 0.03–0.04, 2Vmeas. = 65(2)° and 2Vcalc. = 68°. Pilawite-(Y) is monoclinic P21/c, with unit-cell parameters a = 8.558(3) Å, b = 7.260(3) Å, c = 11.182(6) Å, β = 90.61(4)o, V = 694.7(4) Å3. The crystal structure was refined to an R1 index of 2.76% and consists of chains of edge- and corner-sharing octahedra decorated by tetrahedra and having the stoichiometry [Al2(SiO4)4O(OH)] that link by sharing corners to form an octahedron–tetrahedron framework with large interstices that contain Ca2+ and (Y,Ln)3+. It is a graphical isomer of the Al–P framework in palermoite, Sr2Li4[Al2(PO4)2(OH)2]2. The pilawite-(Y)-bearing assemblage began crystallization at high Y + Ln activities and was modified progressively by a Ca-enriched fluid, resulting in the sequence: keiviite-(Y) → gadolinite-(Y) to hingganite-(Y) + hellandite-(Y) → pilawite-(Y) → allanite-(Y) → epidote/zoisite.

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Aftalion, M. and Bowes, D.R. (2002) U-Pb zircon isotopic evidence for Mid-Devonian migmatite for¬mation in the Góry Sowie domain of the Bohemian Massif, Sudeten Mountains, SW Poland. Neues Jahrbuch für Mineralogy, Monatshefte, 4, 182192.
Anders, E. and Grevesse, N. (1989) Abundances of the elements: Meteoritic and solar. Geochimica et Cosmochimica Acta, 53, 197214.
Bröcker, M., Żelazniewicz, A. and Enders, M. (1998) Rb—Sr and U—Pb geochronology of migmatitic gneisses from the Góry Sowie (West Sudetes, Poland): the importance of Mid—Late Devonian metamorphism. Journal of the Geological Society, London, 155, 10251036.
Brueckner, H.K., Blusztajn, J. and Bakun-Czubarow, N. (1996) Trace element and Sm—Nd “age” zoning in garnets from peridotites of the Caledonian and Variscan mountains and tectonic implications. Journal of Metamorphic Geology, 14, 6173.
Černý, P. and Ercit, T.S. (2005) The classification of granitic pegmatites revisited. The Canadian Mineralogist, 43, 20052026.
Drake, M.J. and Weill, D.F. (1972) New rare earth element standards for electron microprobe analysis. Chemical Geology, 10, 179181.
Finney, J.J. (1963) The crystal structure of carminite. American Mineralogist, 48, 113.
Gordon, S.M., Schneider, D.A., Manecki, M. and Holm, D.K. (2005) Exhumation and metamorphism of an ultrahigh-grade terrane: geochronometric investiga¬tions of the Sudetes Mountains (Bohemia), Poland and Czech Republic. Journal of the Geological Society, London, 162, 841855.
Hatert, F., Lefevre, P. and Fransolet, A.-M. (2011) The crystal structure of bertossaite, CaLi2[Al4(PO4)4(OH,F)4]. The Canadian Mineralogist, 49, 10791087.
Hawthorne, F.C. (1985) Towards a structural classification of minerals: The VIMIVT2jn minerals. American Mineralogist, 70, 455473.
Hawthorne, F.C. (1986) Structural hierarchy in VIMxIIITyjz minerals. The Canadian Mineralogist, 24, 625642.
Hawthorne, F.C. (1990) Structural hierarchy in [6]M[4]Tjn minerals. Zeitschrift fürKristallographie, 192, 152.
Hawthorne, F.C., Ungaretti, L. and Oberti, R. (1995) Site populations in minerals: terminology and presentation of results of crystal-structure refinement. The Canadian Mineralogist, 33, 907911.
Kharisun, T.M.R., Bevan, D.J.M. and Pring, A. (1996) The crystal structure of carminite: refinement and bond valence calculations. Mineralogical Magazine, 60, 805811.
Kryza, R. and Fanning, C.M. (2007) Devonian deep-crustal metamorphism and exhumation in the Variscan Orogen: evidence from SHRIMP zircon ages from the HT-HP granulites and migmatites of the Góry Sowie (Polish Sudetes). Geodinamica Acta, 20, 159176.
Libovitzky, E. (1999) Correlation of O-H stretching frequencies and O—H-0 hydrogen bond lengths in minerals. Monatshefte für Chemie, 130, 10471059.
Mazur, S., Aleksandrowski, P., Kryza, R. and Oberc-Dziedzic, T (2006) The Variscan Orogen in Poland. Geological Quarterly, 50, 89118.
Moore, P.B. and Araki, T (1975) Palermoite, SrLi2Al4(PO4)4(OH)4. Its atomic arrangement and relationship to carminite, Pb2(Fe4(OH)4(AsO4)4. American Mineralogist, 60, 460465.
Novák, M. (2005) Granitic pegmatites of the Bohemian Massif (Czech Republic); mineralogical, geochemical and regional classification and geological significance, significanceAct. MuseiMoraviae, Scientiae geologicae, 90, 375 [in Czech with English summary].
Oberti, R., Della Ventura, G., Ottolini, L., Hawthorne, F. and Bonazzi, P. (2002) Re-definition, nomenclature and crystal chemistry of the hellandite group. American Mineralogist, 87, 745752.
O'Brian, P.J., Kröner, A., Jaeckel, P., Hegner, E., Żelazniewicz, A. and Kryza, R. (1997) Petrological and isotope studies on Palaeozoic high-pressure granulites. Góry Sowie Mts, Polish Sudetes. Journal of Petrology, 38, 433^56.
Pieczka, A., Szuszkiewicz, A., Szełeg, E., Nejbert, K., Lodzinski, M., Ilnicki, S., Turniak, K., Banach, M., Hołub, W., Michałowski, P. and Różniak, R. (2013) (Fe,Mn)—(Ti,Sn)—(Nb,Ta) oxide assemblage in a little fractionated portion of a mixed (NYF + LCT) pegmatite from Piława Górna, the Sowie Mts. block, SW Poland. Journal of Geosciences, 58, 91112.
Pieczka, A., Szuszkiewicz, A., Szełeg, E., Ilnicki, S., Nejbert, K. and Turniak, K. (2014) Samarskite-group minerals and alteration products: an example from the Julianna pegmatitic system, Piława Górna, SW Poland. The Canadian Mineralogist, 52, 303319.
Pouchou, I.L. and Pichoir, F. (1985) “PAP” (phi-rho-z) procedure for improved quantitative microanalysis. Pp. 104—106 in: Microbeam Analysis (I.T Armstrong, editor). San Francisco Press, San Francisco.
Reed, S.J.B. and Buckley, A. (1998) Rare-earth element determination in minerals by electron-probe micro-analysis: application of spectrum synthesis. Mineralogical Magazine, 62, 18.
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112122.
Strunz, H. and Nickel, E.H. (2001) Strunz Mineralogical Tables, Ninth Edition. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.
Szuszkiewicz, A., Szełeg, E., Pieczka, A., Ilnicki, S., Nejbert, K., Turniak, K., Banach, M., Łodzinski, M., Różniak, R. and Michałowski, P. (2013) The Julianna pegmatite vein system at the Piława Górna mine, Góry Sowie Block, SW Poland - preliminary data on geology and descriptive mineralogy. Geological Quarterly, 57, 467484.
Timmermann, H., Parrish, R.R., Noble, S.R. and Kryza, R. (2000) New U—Pb monazite and zircon data from the Sudetes Mountains in SW Poland; evidence for a single-cycle Variscan Orogeny. Journal of the Geological Society, London, 157, 265268.
Van Breemen, O., Bowes, D.R., Aftalion, M. and Żelazniewicz, A. (1988) Devonian tectonothermal activity in the Sowie Góry gneissic block, Sudetes, southwestern Poland: evidence from Rb-Sr and U-Pb isotopic studies. Journal of the Polish Geological Society, 58, 310.
Żelazniewicz, A. (1990) Deformation and metamorphism in the Góry Sowie gneiss complex, Sudetes, SW Poland. Neues Jahrbuch für Geologie und Paläontologie — Abhandlungen, 179, 129—157.
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