| Reference Type | Journal (article/letter/editorial) |
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| Title | Gahnite compositions compared |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Batchelor, Richard A. | Author |
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| Kinnaird, Judith A. | Author |
| Year | 1984 (September) | Volume | 48 |
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| Issue | 348 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_48/48-348-425.pdf+ |
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| DOI | doi:10.1180/minmag.1984.048.348.13Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3649 | Long-form Identifier | mindat:1:5:3649:2 |
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| GUID | 0 |
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| Full Reference | Batchelor, Richard A., Kinnaird, Judith A. (1984) Gahnite compositions compared. Mineralogical Magazine, 48 (348) 425-429 doi:10.1180/minmag.1984.048.348.13 |
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| Plain Text | Batchelor, Richard A., Kinnaird, Judith A. (1984) Gahnite compositions compared. Mineralogical Magazine, 48 (348) 425-429 doi:10.1180/minmag.1984.048.348.13 |
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| In | (1984, September) Mineralogical Magazine Vol. 48 (348) Mineralogical Society |
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| Abstract/Notes | Abstract
Blue-coloured gem-quality spinel from Nigeria was analysed by wet chemical methods (using atomic absorption spectrophotometry) and investigated by X-ray diffraction. The results showed it to be gahnite (unit cell dimension a=8.091Β±0.003 Γ
) containing 36.7% ZnO, 3.58% FeO, and 0.12% MgO. The spinel has an RI of 1.79 and density between 4.4 and 4.59. Broadening of the n[111] XRD reflections indicates a measure of compositional heterogeneity. The gahnite analyses were compared with compositions of zinc spinels from other parts of the world. The analyses cluster into two distinct groups, Mg-rich spinels of metamorphic origin and Mg-poor spinels (including the Nigerian gahnite) with igneous affinities. Diadochy seems to operate within the zinc spinel structure between (Zn + Mn) and (Fe + Mg). |
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