| Reference Type | Journal (article/letter/editorial) |
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| Title | Nepheline solid solutions |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Donnay, Gabrielle | Author |
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| Schairer, J. F. | Author |
| Donnay, J. D. H. | Author |
| Year | 1959 (June) | Volume | 32 |
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| Issue | 245 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_32/32-245-93.pdf+ |
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| DOI | doi:10.1180/minmag.1959.32.245.02 |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5503 | Long-form Identifier | mindat:1:5:5503:5 |
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| GUID | 0 |
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| Full Reference | Donnay, Gabrielle, Schairer, J. F., Donnay, J. D. H. (1959) Nepheline solid solutions. Mineralogical Magazine and Journal of the Mineralogical Society, 32 (245) 93-109 doi:10.1180/minmag.1959.32.245.02 |
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| Plain Text | Donnay, Gabrielle, Schairer, J. F., Donnay, J. D. H. (1959) Nepheline solid solutions. Mineralogical Magazine and Journal of the Mineralogical Society, 32 (245) 93-109 doi:10.1180/minmag.1959.32.245.02 |
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| In | (1959) Mineralogical Magazine Vol. 32 (245) Mineralogical Society |
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| Abstract/Notes | SummaryPublished chemical analyses demonstrate that the nepheline formula should be written KxNayCaz□s-(x+y+z)Alx+y+2zSi16-(x+y+2z)O32, where □ stands for vacant sites. X-ray data are presented for the nepheline phase in four binary systems: Ne-CaAl2O4, Ne-An, Ne-Ab, Ne-Kp. Only in two of these systems do the cell-dimensions change with composition. In the first one, the cell-volume V increases linearly with increasing calcium content; in the last one, two singularities in the curve of V against x divide the phase Na8-xKxAl8Si8O32 into three subphases: subpotassic (0 < x < 0·25), mediopotassic (0·25 < x < 2·00), and perpotassic (2·00 < x < 4·73). Only in the subpotassic range are both high- and low-temperature forms found. Twenty-eight natural nephelines, for which chemical analyses and X-ray data are available in the literature, show that only the potassium content affects cell-dimensions. Although all analysed natural nephelines fall outside the subpotassic range, the re-examination of a Monte Somma specimen studied by Bannister (1931) reveals a few euhedral crystals of subpotassic nepheline in a mediopotassic phase. |
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