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Florenskyite, FeTiP, a new phosphide from the Kaidun meteorite

¹ Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, Moscow 117975, Russia
² Earth Science and Solar System Exploration Division, SN2, NASA Johnson Space Center, Houston, Texas 77058, U.S.A.
³ Institute of Materials Structure Science, Tsukuba-shi, Ibaraki-ken, 305, Japan
⁴ Lockheed Engineering and Science Co., Houston, Texas 77258, U.S.A.
⁵ Mineralogical Institute, Faculty of Science, University of Tokyo, Hongo, Bunkyo-Ku, Tokyo 113, Japan

Correspondence: ^* E-mail: michael.e.zolensky1{at}jsc.nasa.gov

Florenskyite is a new phosphide species from the Kaidun chondritic meteorite, which fell in South Yemen in 1980. Kaidun is a unique chondritic breccia containing a huge variety of fragments of different chondritic types. Florenskyite was found as four dispersed grains with a maximum dimension of 14 µm within a single mass of Fe-rich serpentine within one Kaidun clast. Florenskyite is associated with submicrometer-sized grains of pentlandite and small (up to 1.5 µm in width) laths of a still uncharacterized Fe-Cr phosphide. Florenskyite is creamy white in reflected light, and its luster is metallic. The average of three electron microprobe analyses gave (wt%) Fe 40.52, Ti 30.08, Ni 5.47, Cr 0.93, V 0.91, Co 0.60, P 21.69, Si 0.59, sum 100.79, corresponding to Fe_1.01(Ti_0.87Ni_0.13Cr_0.03V_0.02Co_0.01)_1.06(P_0.97Si_0.03). Single-crystal structure analysis was performed on florenskyite using a Laue pattern collected from a multiple crystal by in-situ synchrotron X-ray diffraction. Florenskyite crystallizes in the space group Pnma, and has the anti-PbCl₂ structure. Previously determined cell constants of synthetic material [a = 6.007(1), b = 3.602(1), c = 6.897(1) Å] were used in the single-crystal data reduction. We used the POWD12 program to calculate a powder XRD pattern; the 5 most intense reflections are d = 2.301 (I = 100), 2.188 (88), 2.307 (47), 1.938 (45), and 1.801 Å (45). Florenskyite is only the fourth phosphide to be described from nature. Its paragenesis may be unique, and may be due to melting of a mineral assemblage including Fe-Ni metal, schreibersite, daubreelite, osbornite, or heideite and subsequent crystallization of phosphides from the melt.

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