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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

Published online by Cambridge University Press:  02 January 2018

Adam Pieczka ,
Frank C. Hawthorne ,
Mark A. Cooper ,
Eligiusz Szełęg ,
Adam Szuszkiewicz ,
Krzysztof Turniak ,
Krzysztof Nejbert  and
Sławomir Ilnicki
Adam Pieczka*
Affiliation:
AGH University of Science and Technology, Department of Mineralogy, Petrography and Geochemistry 30–059 Kraków, Mickiewicza 30, Poland
Frank C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
Mark A. Cooper
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
Eligiusz Szełęg
Affiliation:
University of Silesia, Faculty of Earth Sciences, Department of Geochemistry, Mineralogy and Petrography, 41–200 Sosnowiec, Będzińska 60, Poland
Adam Szuszkiewicz
Affiliation:
University of Wrocław, Institute of Geological Sciences, 50–204 Wrocław, pl. M. Borna 9, Poland
Krzysztof Turniak
Affiliation:
University of Wrocław, Institute of Geological Sciences, 50–204 Wrocław, pl. M. Borna 9, Poland
Krzysztof Nejbert
Affiliation:
University of Warsaw, Faculty of Geology, Institute of Geochemistry, Mineralogy and Petrology, 02–089 Warszawa, Żwirki and Wigury 93, Poland
Sławomir Ilnicki
Affiliation:
University of Warsaw, Faculty of Geology, Institute of Geochemistry, Mineralogy and Petrology, 02–089 Warszawa, Żwirki and Wigury 93, Poland
*
*E-mail: pieczka@agh.edu.pl
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Abstract

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.

Keywords

pilawite-(y)new mineral speciesoptical dataelectron microprobecrystal structureNYF pegmatitePiława GórnaPoland
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 5 , October 2015 , pp. 1143 - 1157
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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