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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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1945-3027
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Volume 83, Issue 5-6

Issues

Pretulite, ScPO4, a new scandium mineral from the Styrian and Lower Austrian lazulite occurrences, Austria

Franz Bernhard
  • Corresponding author
  • Institut für Mineralogie-Kristallographie und Petrologie, Karl-Franzens-Universität Graz, Universitätsplatz 2, A-8010 Graz, Austria
  • Institut fu¨r Technische Geologie und Angewandte Mineralogie, Technische Universität Graz, Rechbauerstrasse 12, A-8010 Graz, Austria
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/ Franz Walter
  • Institut für Mineralogie-Kristallographie und Petrologie, Karl-Franzens-Universität Graz, Universitätsplatz 2, A-8010 Graz, Austria
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/ Karl Ettinger
  • Institut für Mineralogie-Kristallographie und Petrologie, Karl-Franzens-Universität Graz, Universitätsplatz 2, A-8010 Graz, Austria
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/ Josef Taucher / Kurt Mereiter
  • Institut für Mineralogie, Kristallographie und Strukturchemie, Technische Universität Wien, Getreidemarkt 9, A-1060 Wien, Austria
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Published Online: 2015-11-13 | DOI: https://doi.org/10.2138/am-1998-5-621

Abstract

Pretulite is a new Sc phosphate with zircon-type structure from the phyllite-micaschist hosted hydrothermal lazulite-quartz veins in the Lower Austroalpine Grobgneis complex, eastern Austria. The new species is the Sc-dominant analogue of xenotime-(Y) and occurs as an accessory mineral in all investigated lazulite specimens, forming anhedral to euhedral crystals up to 200 μm long with the dominant form {211}. It is associated with lazulite, fluorapatite, chlorapatit, quartz, muscovite, clinochlore, paragonite, kyanite, pyrophyllite, augelite, wardite, hydroxylherderite, goyazite, florencite-(Ce), xenotime-(Y), bearthite, m- tile, pyrite, corundum, and an AlO(OH)-phase. Premlite is translucent to transparent with an adamantine luster, colorless to pale pink, uniaxial positive with ω = 1.790 (5), € = 1.86 (I) and shows a weak orange fluorescence at 254 nm as well as a bright blue cathodoluminescence. Mohs hardness is about 5. The empirical formula for pretulite (based on four O atoms) is (Sc0.98Y0.02)1.00P1.00O4.00. It contains variable amounts of Y with Y/(Y + Sc) = 0.5 - 3.2 mol% and traces of Yb, Er, and Dy. The space group is I41/amd with a = 6.589 (1) Å, c = 5.806 (1) Å, V = 252.1 (1) Å3, dcalc = 3.71 g/cm3, Z = 4. The four strongest lines in the X-ray powder pattern are d200 = 3.293 (100), d112 = 2.4636 (42), d112 = 1.6927 (45), d332 = 1.3697 (15) Å. The crystal structure was refined using 108 reflections to R(Fo) = 0.018. Cell parameters and average M-O distances confirm a small amount of Y sub­stituting Sc in the eightfold-coordinated M-position. The formation of pretulite is attributed to a moderate enrichment of Sc in lazulite-rich domains of the veins (about 180 ppm) and the inability of the accompanying minerals to incorporate larger quantities of Sc in their crystal structure. The name is after the mountain Pretul, Fischbacher Alpen, Styria, Austria.

About the article

Received: 1997-05-09

Accepted: 1997-11-22

Published Online: 2015-11-13

Published in Print: 1998-05-01


Citation Information: American Mineralogist, Volume 83, Issue 5-6, Pages 625–630, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-1998-5-621.

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© 2015 by Walter de Gruyter Berlin/Boston.

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