| Reference Type | Journal (article/letter/editorial) |
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| Title | The spectrochemical determination of feldspars within the field microcline-albite—labradorite |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Fraser, W. E. | Author |
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| Downie, G. | Author |
| Year | 1964 (March) | Volume | 33 |
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| Issue | 264 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-264-790.pdf+ |
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| DOI | doi:10.1180/minmag.1964.033.264.07Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5784 | Long-form Identifier | mindat:1:5:5784:8 |
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| GUID | 0 |
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| Full Reference | Fraser, W. E., Downie, G. (1964) The spectrochemical determination of feldspars within the field microcline-albite—labradorite. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (264) 790-798 doi:10.1180/minmag.1964.033.264.07 |
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| Plain Text | Fraser, W. E., Downie, G. (1964) The spectrochemical determination of feldspars within the field microcline-albite—labradorite. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (264) 790-798 doi:10.1180/minmag.1964.033.264.07 |
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| In | (1962) Mineralogical Magazine Vol. 33 (264) Mineralogical Society |
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| Abstract/Notes | SummaryTwo spectrochemical methods of feldspar determination are described: one based on the flame spectrophotometer; the other on the quartz spectrograph. For the first method, unknown feldspars are dissolved in a mixture of hydrofluoric and perchloric acids and diluted to 1 : 104. Percentages of Or and An are determined by comparison with dissolved feldspar standards at the same dilution; percentages of Ab are estimated by difference. For the second method, unknown feldspars are burned, unadulterated, in the cathode of the spectrograph arc and a visual estimation is made of the intensities of the following lines: Na5688, Na5683, Ca4455, Ca4435, Ca4425, K4047, K4044, Ca3644, K3447, Na3303, Na3302, and Ca3159. The estimated intensities are then substituted in two empirically determined functions:(ICa4455+ICa4435+ICa4255+ICa3644+ICa3159)−4/3(INa5688+INa5683+INa3303+INa3302)and (3INa5688+3INa5683+2INa3303+INa3302)−43(4IK4047+3IK4044+2IK3447) .From the algebraic values of these two functions, the compositions of the unknown feldspars, expressed as percentages of Or, Ab, and An, are read directly from a chart based on results obtained from feldspar standards of known chemical composition. |
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