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Letter. Tistarite, Ti2O3, a new refractory mineral from the Allende meteorite
-
Chi Ma
and
George R. Rossman
Published/Copyright:
April 1, 2015
Abstract
Tistarite, ideally Ti2O3, is a new member of the corundum-hematite group. It is found as one subhedral crystal in a cluster of micrometer-sized refractory grains along with khamrabaevite (TiC), rutile, and corundum crystals within a chondrule from the Allende meteorite. The mean chemical composition determined by electron microprobe analysis is (wt%) Ti2O3 94.94, MgO 2.06, Al2O3 1.50, ZrO2 0.44, FeO 0.24, CaO 0.10, Cr2O3 0.06, sum 99.34. The empirical formula calculated on the basis of 3 O atoms is (Ti3+ 1.90Mg0.07Al0.04Zr0.01)Σ2.02O3. Tistarite is rhombohedral, R3̄c; a = 5.158 Å, c = 13.611 Å, V = 313.61 Å3, and Z = 6. Its electron back-scatter diffraction pattern matches that of synthetic Ti2O3 with the R3̄c structure. The strongest calculated X-ray powder diffraction lines from the synthetic Ti2O3 data are [d spacing in Å (I) hkl]: 3.734 (84) (012), 2.707 (88) (104), 2.579 (90) (110), 2.242 (38) (113), 1.867 (33) (024), 1.703 (100) (116), 1.512 (28) (214), 1.489 (46) (300), 1.121 (20) (226), 0.896 (25) (416). The mineral is named after the composition “Ti” and the word “star,” implying that this new refractory mineral is among the first solids formed in the solar system.
Received: 2009-1-23
Accepted: 2009-3-11
Published Online: 2015-4-1
Published in Print: 2009-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Tistarite;
Ti2O3;
new refractory mineral;
titanium oxide;
Allende meteorite
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