| Reference Type | Journal (article/letter/editorial) |
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| Title | A calcian ralstonite-like mineral from the Cleveland Mine, Tasmania, Australia |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Birch, W. D. | Author |
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| Pring, A. | Author |
| Year | 1990 (December) | Volume | 54 |
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| Issue | 377 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_54/54-377-599.pdf+ |
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| DOI | doi:10.1180/minmag.1990.054.377.11Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1666 | Long-form Identifier | mindat:1:5:1666:1 |
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| GUID | 0 |
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| Full Reference | Birch, W. D., Pring, A. (1990) A calcian ralstonite-like mineral from the Cleveland Mine, Tasmania, Australia. Mineralogical Magazine, 54 (377) 599-602 doi:10.1180/minmag.1990.054.377.11 |
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| Plain Text | Birch, W. D., Pring, A. (1990) A calcian ralstonite-like mineral from the Cleveland Mine, Tasmania, Australia. Mineralogical Magazine, 54 (377) 599-602 doi:10.1180/minmag.1990.054.377.11 |
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| In | (1990, December) Mineralogical Magazine Vol. 54 (377) Mineralogical Society |
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| Abstract/Notes | AbstractA 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 (Na1.47Ca0.52)(Mg1.49Al0.55P0.04)F6 [(OH)0.43O0.36F0.21)].This differs from the ‘pyrochlore’ formula, due to the substitution of Ca + (OH,O,F) for H2O, 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. |
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