| Reference Type | Journal (article/letter/editorial) |
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| Title | Goyazite and florencite from two African carbonatites |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | McKie, Duncan | Author |
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| Year | 1962 (December) | Volume | 33 |
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| Issue | 259 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-259-281.pdf+ |
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| DOI | doi:10.1180/minmag.1962.033.259.03Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5701 | Long-form Identifier | mindat:1:5:5701:5 |
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| GUID | 0 |
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| Full Reference | McKie, Duncan (1962) Goyazite and florencite from two African carbonatites. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (259) 281-297 doi:10.1180/minmag.1962.033.259.03 |
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| Plain Text | McKie, Duncan (1962) Goyazite and florencite from two African carbonatites. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (259) 281-297 doi:10.1180/minmag.1962.033.259.03 |
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| In | (1962) Mineralogical Magazine Vol. 33 (259) Mineralogical Society |
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| Abstract/Notes | SummaryFlorencite with ω 1·653, εd 1·661, G 3·457, a 6·971 ± 0·004 Å, c 16·42±0·13 Å, and rhombohedral unit-cell contents Sr0·42Ce0·52Ca0·14Al2·83(PO4)1·77(SO4)0·10 F0·41(OH)5·24(H2O)0·85 occurs in the Kangankunde carbonatite in Nyasaland, and goyazite with G 3·386, a 6·982±0·001 Å, c 16·54±0·02 Å, and rhombohedral unit-cell contents Ba0·05Sr0·50Ce0·41Ca0·08A2·78(PO4)1·62(SO4)0·19F0·30(OH)5·30(H2O)1·18 on the Wigu carbonatite in Tanganyika. Hydrothermal decomposition experiments in the Wigu material indicate stability below 535 ± 10 °C at pH2O 200 bars and 565 ± 10°C at pH2O 2500 bars ; both minerals exhibit endothermic peaks at 630°C in differential thermal analyses. The crystal chemistry of the goyazite series is discussed in the light of the two new analyses and of newly determined unit-cell dimensions for four other members of the goyazite series. Goyazite, florencite, and gorceixite appear to have crystallized during late-stage replacement processes or under supergene conditions in carbonatites. |
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