Kerimasite, Ca3Zr2(Fe23+Si)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania
| Autor: | John Spratt, I. V. Kuznetsova, Sergey V. Petrov, C. T. Williams, J. Keller, Anatoly N. Zaitsev, S. N. Britvin |
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| Rok vydání: | 2010 |
| Předmět: |
Calcite
Zirconium geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Analytical chemistry Mineralogy chemistry.chemical_element Cleavage (crystal) Electron microprobe 010502 geochemistry & geophysics 01 natural sciences Eluvium chemistry.chemical_compound Impact crater chemistry Volcano Geochemistry and Petrology Carbonatite Geology 0105 earth and related environmental sciences |
| Zdroj: | Mineralogical Magazine. 74:803-820 |
| ISSN: | 1471-8022 0026-461X |
| Popis: | Kerimasite, ideally is a new calcium zirconium silicate-ferrite member of the garnet group from the extinct nephelinitic volcano Kerimasi and surrounding explosion craters in northern Tanzania. The mineral occurs as subhedral crystals up to 100 μm in size in calcite carbonatites, and as euhedral to subhedral crystals up to 180 μm in size in carbonatite eluvium. Kerimasite is light to dark-brown in colour and transparent with a vitreous lustre. No cleavage or parting was observed and the mineral is brittle. The calculated density is 4.105(1) g/cm3. The micro-indentation, VHN25, ranges from 1168 to 1288 kg/mm2. Kerimasite is isotropic with n = 1.945(5). The average chemical formula of the mineral derived from electron microprobe analyses (sample K 94-25) and calculated for O = 12 and all Fe as Fe2O3 is (Ca3.00Mn0.01Ce0.01Nd0.01)Σ3.03(Zr1.72Nb0.14Ti0.08Mg0.02Y0.02)Σ1.98(Ti0.09)Σ3.00O12. The largest Fe content determined in kerimasite is 21.6 wt.% Fe2O3 and this value corresponds to 1.66 a.p.f.u. in the tetrahedral site. Kerimasite is cubic, space group with a = 12.549(1) Å, V = 1976.2(4) Å3 and Z = 8. The five strongest powder-diffraction lines [d in Å, (I/Io), hkl] are: 4.441 (49) (220), 3.140 (91) (400), 2.808 (70) (420), 2.564 (93) (422) and 1.677 (100) (642). Single-crystal structure refinement revealed the typical structure of the garnet-group minerals. The name is given after the locality, Kerimasi volcano, Tanzania. |
| Databáze: | OpenAIRE |
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