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- W2067342385 abstract "Abstract A calcium-rich ralstonite, forming colourless octahedral crystals up to 2 mm across, occurs in a F-rich assemblage at the Cleveland Mine, northwestern Tasmania. Other minerals present include well-crystallized morinite, gearksutite, vivianite, siderite, K-rich feldspar (adularia), fluorite and quartz. The F-rich assemblage probably formed during greisenization when Na and F-rich magmatic brines reacted with enclosing carbonate host rocks to produce hydrothermal Na-Ca-Mg-bearing solutions. Chemical analysis of the ralstonite-like mineral gave a formula (Na 1.47 Ca 0.52 )(Mg 1.49 Al 0.55 P 0.04 )F 6 [(OH) 0.43 O 0.36 F 0.21 )]. This differs from the ‘pyrochlore’ formula, due to the substitution of Ca + (OH,O,F) for H 2 O, in addition to the coupled substitution of Na + Mg for Al in ‘normal’ ralstonites. The Cleveland Mine ralstonite has the highest recorded Ca, Na and Mg contents. While the mineral is likely to be a new species on chemical grounds, single crystal X-ray photographs indicate the structure is disordered, possibly composed of small compositional domains." @default.
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- W2067342385 date "1990-12-01" @default.
- W2067342385 modified "2023-09-26" @default.
- W2067342385 title "A calcian ralstonite-like mineral from the Cleveland Mine, Tasmania, Australia" @default.
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- W2067342385 doi "https://doi.org/10.1180/minmag.1990.054.377.11" @default.
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