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Moraskoite, Na2Mg(PO4)F, a new mineral from the Morasko IAB-MG iron meteorite (Poland)

Published online by Cambridge University Press:  02 January 2018

Łukasz Karwowski ,
Joachim Kusz ,
Andrzej Muszyński ,
Ryszard Kryza ,
Maciej Sitarz  and
Evgeny V. Galuskin
Łukasz Karwowski
Affiliation:
Department of Geochemistry, Mineralogy and Petrography, Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
Joachim Kusz
Affiliation:
Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
Andrzej Muszyński
Affiliation:
Geological Institute, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznań, Poland
Ryszard Kryza*
Affiliation:
Institute of Geological Sciences, University of Wrocław, Cybulskiego 30, 50-205 Wrocław, Poland
Maciej Sitarz
Affiliation:
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30-059 Kraków, Poland
Evgeny V. Galuskin
Affiliation:
Department of Geochemistry, Mineralogy and Petrography, Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
*
*E-mail: ryszard.kryza@ing.uni.wroc.pl
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Abstract

Moraskoite, a new natural phosphate of composition Na2Mg(PO4)F, has been found in the Morasko IAB-MG iron meteorite. The new phosphate occurs in a graphite-troilite inclusion enclosed in a kamacite-taenite matrix. Associated minerals in the inclusions are chlorapatite, buchwaldite, brianite, merrillite, a new phosphate phase of composition Na4MgCa3(PO4)4, chromite, enstatite (bronzite), kosmochlor, kosmochlor–augite, olivine, albite, orthoclase, quartz, cohenite, schreibersite, nickelphosphide, altaite, pyrrhotite, sphalerite, daubreelite, djerfischerite, whitlockite and native Cu. The inclusions are rimmed by a schreibersite-cohenite halo. Moraskoite forms aggregates up to 1.5 mm in size, with individual grains 20–300 μm across. It is colourless and transparent, with a white streak and vitreous lustre; fluorescence is weak blue in ultraviolet radiation (254 and 360 nm); hardness is 4–5; it has irregular, conchoidal fracture and cleavage is rarely observed. Calculated density (using the empirical formula) is 2.925 g cm–3. The moraskoite structure (Pbcn, a = 5.2117(10), b = 13.711(3), c = 11.665(2) Å, V = 833.6(3) Å3 and Z = 8) is similar to that of its synthetic analogue. The strongest diffraction lines of the moraskoite powder diffraction pattern are as follows (dhkl, I): 3.909(75), 3.382(52), 2.955(90), 2.606(100), 2.571(96), 2.545(68), 1.691 (67). In the Raman spectrum, the following characteristic bands are distinguished (cm–1, strong bands bold): 1114, 1027, 962, 589, 438, 336, 308, 279, 262, 244, 193, 184, 147 and 131. The Raman data prove the absence of H2O and CO2. Moraskoite is interpreted as being a primary phosphate, which crystallized together with graphite, troilite and other accessories inside the nodule.

Keywords

moraskoitenew mineralphosphatefluoridestructureRamaniron meteoritesMorasko
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 2 , April 2015 , pp. 387 - 398
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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