| Reference Type | Journal (article/letter/editorial) |
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| Title | An experimental study of ordering in sodium-rich alkali feldspars |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Parsons, Ian | Author |
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| Year | 1968 (December) | Volume | 36 |
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| Issue | 284 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_36/36-284-1061.pdf+ |
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| DOI | doi:10.1180/minmag.1968.036.284.04Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6204 | Long-form Identifier | mindat:1:5:6204:0 |
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| GUID | 0 |
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| Full Reference | Parsons, Ian (1968) An experimental study of ordering in sodium-rich alkali feldspars. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (284) 1061-1077 doi:10.1180/minmag.1968.036.284.04 |
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| Plain Text | Parsons, Ian (1968) An experimental study of ordering in sodium-rich alkali feldspars. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (284) 1061-1077 doi:10.1180/minmag.1968.036.284.04 |
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| In | (1966) Mineralogical Magazine Vol. 36 (284) Mineralogical Society |
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| Abstract/Notes | SummaryVariations in the value of 2θ131 – 2θ13̄1 of two anorthoclase feldspars of compositions Ab95Or5 and Ab90Or10 were investigated by hydrothermal crystallization of gels for long periods in the temperature range 500–950 °C, at water vapour pressures up to 15 000 lb/in.2. The results are compared to those obtained by MacKenzie (1957) for pure albite. It is shown that the variation in 2θ131 – 2θ13̄1 is largely the result of Al-Si order-disorder and that at 700 °C and above the magnitude of the variation in the anorthoclases suggests that the degree of order is like that in albite, but at lower temperatures, particularly below 600 °C, the variation is less, and the anorthoclases are less ordered than albite at the same temperatures. At 600 °C and above the rate of attainment of equilibrium is the same for all three compositions. Below 600 °C Ab95Or5 behaves differently to albite. At low temperatures the equilibrium degree of Al-Si order in mixed Na-K feldspars is a function of composition as well as of temperature of crystallization. |
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