Ferroindialite (Fe2+,Mg)2Al4Si5O18, a new beryl-group mineral from the Eifel volcanic region, Germa

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• 作者：N. V. Chukanov ; S. M. Aksenov ; I. V. Pekov ; B. Ternes…
• 刊名：Geology of Ore Deposits
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：56
• 期：8
• 页码：637-643
• 全文大小：695 KB
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  5. Kitamura, M. and Hiroi, Y., Indialite from Unazuki pelitic schist, Japan, and its transition texture to cordierite, / Contrib. Mineral. Petrol., 1982, vol. 80, pp. 110-16. CrossRef
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  9. Miyashiro, A., Iiyama, T., Yamasaki, M., and Miyashiro, T., The polymorphism of cordierite and indialite, / Am. J. Sci., 1955, vol. 253, pp. 185-08. CrossRef
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  12. Schairer, J.F. and Yagi, K., The system FeO-Al₂O₃-SiO₂, / Am. J. Sci., 1952, Bowen vol., pp. 471-12.
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• 刊物主题：Mineral Resources;
• 出版者：Springer US
• ISSN：1555-6476

文摘

A new mineral, ferroindialite, a Fe2+-dominant analog of indialite, has been found in a pyrometamorphosed xenolith of pelitic rock hosted in alkaline basalts. Associated minerals are phlogopite, sanidine, sillimanite, pyroxenes of the enstatite-ferrosilite series, wagnerite, fluorapatite, tridymite, zircon and almandine. Ferroindialite forms brown-purple to gray with a violet-blue tint short prismatic or thick tabular hexagonal crystals up to 1.5 mm in size. The new mineral is brittle, with a Mohs-hardness of 7. Cleavage is not observed. D meas = 2.66(1), D calc = 2.667 g/cm3. IR spectrum shows neither H2O nor OH groups. Ferroindialite is anomalously biaxial (?, α = 1.539(2), β = 1.552(2), γ = 1.554(2), 2V meas = 30(10)°. The mineral is weakly pleochroic, ranging from colorless on X to pale violet on Z. Dispersion is weak, r v. The chemical composition (electron microprobe, mean of five point analyses, wt %) is as follows: 0.14 Na2O, 0.46 K2O, 4.95 MgO, 1.13 MnO, 12.66 FeO, 2.64 Fe2O3, 30.45 Al2O3, 47.22 SiO2, total is 99.65. The distribution of total iron content between Fe2+ and Fe3+ was carried out according to structural data. The empirical formula of ferroindialite is: (K0.06Na0.03)(Fe 1.12 2+ Mg0.78Mn0.10)Σ2.00(Al3.79Fe 0.21 3+ )Σ4.00Si4.98O18. The simplified formula is: (Fe2+,Mg)2Al4Si5O18. The crystal structure has been refined on a single crystal, R = 0.049. Ferroindialite is hexagonal, space group P6/mcc; a = 9.8759(3), c = 9.3102(3) ?, V = 786.40(3) ?3, Z = 2. The strongest lines in the X-ray powder diffraction pattern [d, ? (I, %) (hkl)] are: 8.59 (100) (100), 4.094 (27) (102), 3.390 (35) (112), 3.147 (19) (202), 3.055 (31) (211), 2.657 (12) (212), 1.695 (9) (224). The type specimen of ferroindialite is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, registration number 4400/1.