McKie, Duncan (1963) The högbomite polytypes. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (262) 563-580 doi:10.1180/minmag.1963.033.262.03
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | The högbomite polytypes | ||
| Journal | Mineralogical Magazine and Journal of the Mineralogical Society | ||
| Authors | McKie, Duncan | Author | |
| Year | 1963 (September) | Volume | 33 |
| Page(s) | 563-580 | Issue | 262 |
| Publisher | Mineralogical Society | ||
| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-262-563.pdf+ | ||
| DOI | doi:10.1180/minmag.1963.033.262.03Search in ResearchGate | ||
| Mindat Ref. ID | 5748 | Long-form Identifier | mindat:1:5:5748:0 |
| GUID | 1c94383c-f937-49e0-a746-e5ce6a5e4432 | ||
| Full Reference | McKie, Duncan (1963) The högbomite polytypes. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (262) 563-580 doi:10.1180/minmag.1963.033.262.03 | ||
| Plain Text | McKie, Duncan (1963) The högbomite polytypes. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (262) 563-580 doi:10.1180/minmag.1963.033.262.03 | ||
| In | (1962) Mineralogical Magazine Vol. 33 (262) Mineralogical Society | ||
| Abstract/Notes | SummarySingle crystal X-ray examination has shown that högbomite forms a series of polytypes, designated nH or nR, with hexagonal or rhombohedral lattices and hexagonal unit-cell dimensions a 5·72 Å, c 4·6 × n Å. The polytypes arise by variation, in a manner as yet undetermined, of the stacking sequence of approximately close-packed oxygen layers with interstitial cations on fourfold and on sixfold sites; the composition of 1/nth of a unit-cell may be represented as R2+1.0_1.6T4+0.2-0.4R3+3.7-4.3O2-7.6-8.0(OH)-0-0.4,, where R2+ = Zn, Fe, Mg, and R2+ = Fe, Al. The polytypes so far observed are 4H, 5H, 6H, 15H, 15R, and 18R. Minerals structurally related to högbomite are nigerite (3H) and taaffeite (4H). A new occurrence of högbomite, polytype 5H, with composition Ti1·7Fe1·6Mg6·3Al18·8Si0·2O40, is described from a spinel-free paragenesis in a magnesian skarn at Mautia Hill, Tanganyika. Another new occurrence in an aluminous xenolith in the Cashel gabbro in Co. Galway, Ireland, is recorded. X-ray powder data are given for two of the polytypes. | ||
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