Preiswerkite: A First Occurrence in Marble Hosting Gem Spinel Deposits, Luc Yen, Vietnam
نویسندگان
چکیده
We report a new occurrence of preiswerkite, the rare sodium analog eastonite, trioctahedral mica, from marble-hosted noble spinel deposits Luc Yen district, northern Vietnam. It is found in marble for first time. The preiswerkite anhedral and associated with phlogopite, aspidolite, sadanagaite, pargasite, spinel, corundum, dolomite calcite. average compositions (Na0.88Ca0.08K0.01)Σ0.97(Mg2.29Al0.72Fe0.04)Σ3.05)[(Al1.95Si2.05)Σ4.00O10](OH)2. have narrow range Mg# values (0.96–0.99) define preiswerkite-aspidolite solid-solution series. Compared other occurrences, has low iron content, which attains 0.09 atoms per formula unit (1.53 wt.% FeO). formation favored by proportion Mg, Al Si precursor rocks increased activity H2O fluid phase.
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ژورنال
عنوان ژورنال: Minerals
سال: 2022
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min12081024