• journal_title：European Journal of Mineralogy
• Contributor：Irina O. Galuskina ; Evgeny V. Galuskin ; Joachim Kusz ; Piotr Dzierżanowski ; Krystian Prusik ; Viktor M. Gazeev ; Nikolai N. Pertsev ; Leonid Dubrovinsky
• Publisher：E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
• Date：2013-02-01
• Format：text/html
• Language：en
• Identifier：10.1127/0935-1221/2013/0025-2288
• journal_abbrev：Eur J Mineral
• issn：0935-1221
• volume：25
• issue：2
• firstpage：231
• section：Articles

Dzhuluite, Ca₃SbSnFe³⁺₃O₁₂ (Ia3̄d, a = 12.536(3) Å, V = 1970.05(9) Å ³, Z = 8), a new antimony garnet of the bitikleite-group, was discovered in a kumtyubeite zone in close proximity to the contact with unaltered ignimbrite in a skarn xenolith from the Upper Chegem Caldera, Northern Caucasus, Russia. The empirical formula of the holotype dzhuluite is (Ca_2.954Fe²⁺_0.043Mg_0.003)_∑3.000 (Sn_0.850Sb⁵⁺_0.764Zr_0.121U⁶⁺_0.127Ti⁴⁺_0.070Sc_0.009Nb⁵⁺_0.058Hf_0.001)_∑2.001(Fe³⁺_2.051Al_0.653Fe²⁺_0.182 Ti⁴⁺_0.087Si_0.028)_∑3.001O₁₂. Associated minerals are kumtyubeite, cuspidine, fluorchegemite, larnite, fluorite, wadalite, rondorfite, hydroxylellestadite, perovskite, lakargiite, kerimasite, elbrusite, srebrodolskite, bultfonteinite, ettringite group minerals, hillebrandite, afwillite, tobermorite-like minerals, hydrocalumite and hydrogrossular. Dzhuluite forms poikilitic crystals <50 μm in size that are light-yellow to dark-brown and with a creamy streak. The lustre is strongly vitreous. The calculated density of dzhuluite ranges from 4.708 to 4.750 g/cm³. Raman spectra are analogous to those of kimzeyite, kerimasite and other bitikleite-group minerals. Dzhuluite formed at high temperature during a retrograde stage of primary rock alteration in the larnite subfacies (sanidinite facies) as a result of fluorine metasomatism.