• journal_title：American Mineralogist
• Contributor：Irina O. Galuskina ; Evgeny V. Galuskin ; Piotr Dzierżanowski ; Viktor M. Gazeev ; Krystian Prusik ; Nikolai N. Pertsev ; Antoni Winiarski ; Aleksandr E. Zadov ; Roman Wrzalik
• Publisher：Mineralogical Society of America
• Date：2010-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2010.3421
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：95
• issue：8-9
• firstpage：1305
• section：Articles

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 (Ca_2.989Fe²⁺_0.011) _∑3(Sn⁴⁺_1.463Sb⁵⁺_0.325Ti⁴⁺_0.193Zr_0.013Mg_0.003Nb⁵⁺_0.002Cr_0.001) _∑2(Fe³⁺_1.633Al_0.609Si_0.552Ti⁴⁺_0.166Fe²⁺_0.039V⁵⁺_0.001) _∑3O₁₂. The mineral forms thin regular growth zones and irregular spots in the Fe³⁺-dominant analog of kimzeyite. Toturite is cubic, m>Iam><ovl>3</ovl>m>dm>, m>am> ≈ 12.55 Å, as is confirmed by electron backscatter diffraction (EBSD) data. The strongest lines of the calculated powder diffraction pattern are [m>dm>, Å (m>hklm>) m>Im>]: 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 °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.