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Zabinskiite, ideally Ca(Al (sub 0.5) Ta (sub 0.5) )(SiO (sub 4) )O; a new mineral of the titanite group from the Pilawa Gorna pegmatite, the Gory Sowie Block, southwestern Poland

Adam Pieczka, Frank C. Hawthorne, Chi Ma, George R. Rossman, Eligiusz Szeleg, Adam Szuszkiewicz, Krzysztof Turniak, Krzysztof Nejbert, Slawomir S. Ilnicki, Philippe Buffat and Bogdan Rutkowski
Zabinskiite, ideally Ca(Al (sub 0.5) Ta (sub 0.5) )(SiO (sub 4) )O; a new mineral of the titanite group from the Pilawa Gorna pegmatite, the Gory Sowie Block, southwestern Poland
Mineralogical Magazine (June 2017) 81 (3): 591-610

Abstract

Zabinskiite, ideally Ca(Al (sub 0.5) Ta (sub 0.5) )(SiO (sub 4) )O, was found in a Variscan granitic pegmatite at Pilawa Gorna, Lower Silesia, SW Poland. The mineral occurs along with (Al,Ta,Nb)- and (Al,F)-bearing titanites, a pyrochlore-supergroup mineral and a K-mica in compositionally inhomogeneous aggregates, approximately 120 mu m X 70 mu m in size, in a fractured crystal of zircon intergrown with polycrase-(Y) and euxenite-(Y). Zabinskiite is transparent, brittle, brownish, with a white streak, vitreous lustre and a Mohs hardness of approximately 5. The calculated density for the refined crystal is equal to 3.897 g cm (super -3) , but depends strongly on composition. The mineral is non-pleochroic, biaxial (-), with mean refractive indices > or =1.89. The (Al,Ta,Nb)-richest zabinskiite crystal, (Ca (sub 0.980) Na (sub 0.015) ) (sub Sigma =0.995) (Al (sub 0.340) Fe (super 3+) (sub 0.029) Ti (sub 0.298) V (sub 0.001) Zr (sub 0.001) Sn (sub 0.005) Ta (sub 0.251) Nb (sub 0.081) ) (sub Sigma = 1.005) [(Si (sub 0.988) Al (sub 0.012) )O (sub 4.946) F (sub 0.047) (OH) (sub 0.007) ) (sub Sigma =5.000) ]; 60.7 mol.% Ca[Al (sub 0.5) (Ta,Nb) (sub 0.5) ](SiO (sub 4) )O; is close in composition to previously described synthetic material. Zabinskiite is triclinic (space group symmetry A1) and has unit-cell parameters a = 7.031(2) A, b = 8.692(2) A, c = 6.561(2) A, alpha = 89.712(11) degrees , beta = 113.830(13) degrees , gamma = 90.352(12) degrees and V = 366.77 (11) A (super 3) . It is isostructural with triclinic titanite and bond-topologically identical with titanite and other minerals of the titanite group. Zabinskiite crystallized along with (Al,Ta,Nb)-bearing titanites at increasing Ti and Nb, and decreasing Ta activities, almost coevally with polycrase-(Y) and euxenite-(Y) from Ca-contaminated fluxed melts or early hydrothermal fluids.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 81
Serial Issue: 3
Title: Zabinskiite, ideally Ca(Al (sub 0.5) Ta (sub 0.5) )(SiO (sub 4) )O; a new mineral of the titanite group from the Pilawa Gorna pegmatite, the Gory Sowie Block, southwestern Poland
Affiliation: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica, Department of Mineralogy, Petrography and Geochemistry, Cracow, Poland
Pages: 591-610
Published: 201706
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 70
Accession Number: 2017-077398
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
N50°42'12" - N50°42'12", E16°44'12" - E16°44'12"
Secondary Affiliation: University of Manitoba, CAN, CanadaCalifornia Institute of Technology, USA, United StatesUniversity of Silesia, POL, PolandUniversity of Wroclaw, POL, PolandUniversity of Warsaw, POL, Poland
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201741
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