Harkerite from the Alban Hills,Italy |
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| Authors: | M Barbieri D Cozzupoli M Federico M Fornaseri S Merlino P Orlandi L Tolomeo |
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| Affiliation: | 1. Institute of Geochemistry, University of Rome, Italy;2. Institute of Mineralogy and Petrography, University of Rome, Italy;3. Institute of Mineralogy and Petrography, University of Pisa, Italy |
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| Abstract: | Harkerite, found in metamorphic ejecta of the Alban Hills associated with cuspidine, grossular, phlogopite, vesuvian, biotite, and minor amounts of diopside, aegirinaugite, leucite, magnetite and calcito, shows cubic Laue symmetry m3m, possible space groups Fm3m, F432, F43m, a0 = 14.82 Å.On the basis of isomorphous replacements suggested by the crystal structure analysis, chemical data may be represented by the formula: Ca48Mg16(AlSi4O16)4(BO3)12(CO3)20 · 4H2O. Refractive index nD = 1.6490.The relations between harkerite from Albano, harkerite from Skye and other known harkerites and sakhaites are discussed. |
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