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- W2804742754 abstract "ABSTRACT A reinvestigation of the type specimen of wadalite, ideally Ca 12 Al 10 Si 4 O 32 Cl 6 , from Tadano, Fukushima Prefecture, Japan, reveals that it has well-defined chemical sector zoning. The mineral occurs in skarn xenoliths in two-pyroxene andesite and forms tris-tetrahedral crystals up to 1 mm in size. The mineral is cubic, I ¯43 d , with a = 12.009(2) Å, V = 1731.8(8) Å 3 and Z = 2. The zoning is divided into two sectors, {21¯1} and {211}, on the basis of back-scattered-electron images. The {21¯1} sector is more enriched in Fe 3+ , Si, Mg and Cl, and depleted in Al than the {211} sector. The empirical formulae yielded by the averaged compositions for the {21¯1} and {211} sectors are: Ca 12.01 (Al 7.88 $hbox{Fe}_{{rm 0}{rm. 99}}^{{rm 3 +}} $ Si 4.51 Mg 0.56 Ti 0.05 ) Σ13.99 O 32.22 Cl 5.55 and Ca 12.05 (Al 8.42 $hbox{Fe}_{{rm 0}{rm. 85}}^{{rm 3 +}} $ Si 4.20 Mg 0.44 Ti 0.04 ) Σ13.95 O 32.19 Cl 5.38 , respectively. Compositional variations in the wadalite grains suggest that the Si contents are controlled mainly by the substitution T (Al,Fe 3+ ) + W □ ↔ T Si + W (Cl,F). The presence of sector zoning suggests that the wadalite grew during rapid non-equilibrium crystallization." @default.
- W2804742754 created "2018-06-01" @default.
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- W2804742754 date "2018-05-15" @default.
- W2804742754 modified "2023-10-16" @default.
- W2804742754 title "A reinvestigation of holotype wadalite from Tadano, Fukushima Prefecture, Japan" @default.
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- W2804742754 doi "https://doi.org/10.1180/minmag.2017.081.086" @default.
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