| Reference Type | Journal (article/letter/editorial) |
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| Title | The unit-cell of aenigmatite |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Kelsey, C. H. | Author |
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| McKie, Duncan | Author |
| Year | 1964 (September) | Volume | 33 |
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| Issue | 266 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-266-986.pdf+ |
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| DOI | doi:10.1180/minmag.1964.033.266.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5815 | Long-form Identifier | mindat:1:5:5815:9 |
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| GUID | 0 |
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| Full Reference | Kelsey, C. H., McKie, Duncan (1964) The unit-cell of aenigmatite. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (266) 986-1001 doi:10.1180/minmag.1964.033.266.06 |
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| Plain Text | Kelsey, C. H., McKie, Duncan (1964) The unit-cell of aenigmatite. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (266) 986-1001 doi:10.1180/minmag.1964.033.266.06 |
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| In | (1962) Mineralogical Magazine Vol. 33 (266) Mineralogical Society |
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| Abstract/Notes | SummaryRedetermination of the unit-cell dimensions as a 10·406 Å, b 10·813 Å, c 8·926 Å, α 104° 56′, β 96° 52′, γ 125° 19′, has shown that the hitherto accepted unit-cell of Gossner and Spielberger (1929) is in error. The morphological unit-cell of Palache (1933) is related to the new unit-cell, to a high degree of precision, by the transformation Palache → Kelsey-MeKie [001∕01½½∕½00]. Fifteen published and two new analyses indicate that the unit-cell contents approach Na+4 [Fe2-10- Ti4+2] Si4+12O2-40. The common twin axis constitutes the diad of a pseudo-monoclinic cell, the (010) plane of which is dimensionally closely related to that of pyroxenes and amphiboles. It is suggested that the aenigmatite structure is based on silicate chains of pyroxene type cross-linked by Ti4+ and Fe2+ on distinct 6-fold sites, with Na+ on sites of higher coordination number. Aenigmatite from volcanic in contrast to that from plutonic parageneses is often submicroscopically twinned and may be inverted from a high temperature monoclinic polymorph. |
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