Journal
AMERICAN MINERALOGIST
Volume 95, Issue 8-9, Pages 1305-1311Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2010.3421
Keywords
Garnet; toturite; Fe3+-dominant analog of kimzeyite; Sn; Sb; Raman spectroscopy; EBSD; Lakargi Mountain; Russia
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Funding
- Russian Foundation of Basic Researches [08-05-00181]
- Ministry of Science and Higher Education of Poland [N307 097038]
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A new Sn-rich garnet, toturite Ca3Sn2Fe2SiO12, occurs as an accessory mineral in high-temperature altered carbonate-silicate xenoliths in ignimbrite of the Upper Chegem structure in the Northern Caucasus, Kabardino-Balkaria, Russia. The empirical formula of toturite from the holotype sample is (Ca2.989Fe0.0112+)(Sigma 3)(Sn1.4634+Sb0.3255+Ti0.1934+Zr0.013Mg0.003Nb0.0025+Cr0.001)(Sigma 2)(Fe1.6333+Al0.609Si0.552Ti0.1664+Fe0.0392+V0.0015+)(Sigma 3)O-12. The mineral forms thin regular growth zones and irregular spots in the Fe3+-dominant analog of kimzeyite. Toturite is cubic, la (3) over bard, a approximate to 12.55 angstrom, as is confirmed by electron backscatter diffraction (EBSD) data. The strongest lines of the calculated powder diffraction pattern are [d, angstrom (hkl) I]: 2.562 (422) 100, 1.677 (642) 91, 3.138 (400) 74, 4.437 (220) 67, 1.146 (10.4.2) 31, 1.046 (884) 25, 1.984 (620) 23. Raman spectra of toturite are analogous to those of kimzeyite and shows the following diagnostic bands (cm(-1)): 244, 301, 494, 497, 575, 734. The association of toturite with larnite, rondorfite, wadalite, magnesioferrite, lakargiite, and cuspidine indicates a high temperature (>800 degrees C) of formation. The mineral name is given after the Totur River situated in Eltyubyu village, also Totur is the name of a Balkarian god.
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