| Reference Type | Journal (article/letter/editorial) |
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| Title | Emeleusite: a new LiNaFeIII silicate from south Greenland |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Upton, B. G. J. | Author |
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| Hill, P. G. | Author |
| Johnsen, O. | Author |
| Petersen, O. V. | Author |
| Year | 1978 (March) | Volume | 42 |
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| Issue | 321 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_42/42-321-31.pdf+ |
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| DOI | doi:10.1180/minmag.1978.042.321.03Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 2854 | Long-form Identifier | mindat:1:5:2854:1 |
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| GUID | 0 |
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| Full Reference | Upton, B. G. J., Hill, P. G., Johnsen, O., Petersen, O. V. (1978) Emeleusite: a new LiNaFeIII silicate from south Greenland. Mineralogical Magazine, 42 (321) 31-34 doi:10.1180/minmag.1978.042.321.03 |
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| Plain Text | Upton, B. G. J., Hill, P. G., Johnsen, O., Petersen, O. V. (1978) Emeleusite: a new LiNaFeIII silicate from south Greenland. Mineralogical Magazine, 42 (321) 31-34 doi:10.1180/minmag.1978.042.321.03 |
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| In | (1978, March) Mineralogical Magazine Vol. 42 (321) Mineralogical Society |
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| Abstract/Notes | SummaryEmeleusite (Li2Na4Fe2IIISi12O30) is an orthorhombic (pseudohexagonal) mineral occurring as euhedra within a facies of a peralkaline trachyte dyke. The composition is: SiO2 70·75; TiO2 0·55; ZrO2 0·10; Al2O3 1·34; Fe2O3 12·13; MgO 0·10; MnO 0·03; Na2O 11·98; Li2O 2·78:99·76. The density is 2·775 g/cm3 (calculated) and 2·76(7) g/cm3 (determined); hardness 5–6. It is colourless, transparent, and has a glassy lustre. Emeleusite is biaxial negative with 2Va, varying from near-zero to c. 30° r » v. The refractive indices are α 1·596; β 1·597; y 1·597; with α ∥ b; β ∥ a; y ∥ c. Emeleusite can occur as interpenetration triplets with {110} as twin planes. The space group is Acam or Aba2 with a = 10·073±0·002 Å; b = 17·350±0·005 Å and c = 14·010±0·005 Å. Z = 4. Prominent powder diffraction lines are 7·001(5) 002, 4·352(10) 220, 040, 3·501(7) 004, 3·209(8) 311, and 3·090(7) 124. While the structure is as yet unknown it is suggested that it is an orthorhombic associate of the milarite group. |
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