| Reference Type | Journal (article/letter/editorial) |
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| Title | Högbomite in sapphirine-bearing rocks from the Bamble Sector, south Norway |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Visser, D. | Author |
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| Thijssen, P. H. M. | Author |
| Schumacher, J. C. | Author |
| Year | 1992 (September) | Volume | 56 |
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| Page(s) | 343-351 | Issue | 384 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_56/56-384-343.pdf+ |
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| DOI | doi:10.1180/minmag.1992.056.384.06Search in ResearchGate |
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| Mindat Ref. ID | 1838 | Long-form Identifier | mindat:1:5:1838:2 |
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| GUID | 9b91aa41-cd3c-4e99-8687-ff70078d60d6 |
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| Full Reference | Visser, D., Thijssen, P. H. M., Schumacher, J. C. (1992) Högbomite in sapphirine-bearing rocks from the Bamble Sector, south Norway. Mineralogical Magazine, 56 (384) 343-351 doi:10.1180/minmag.1992.056.384.06 |
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| Plain Text | Visser, D., Thijssen, P. H. M., Schumacher, J. C. (1992) Högbomite in sapphirine-bearing rocks from the Bamble Sector, south Norway. Mineralogical Magazine, 56 (384) 343-351 doi:10.1180/minmag.1992.056.384.06 |
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| In | (1992, September) Mineralogical Magazine Vol. 56 (384) Mineralogical Society |
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| Abstract/Notes | AbstractHögbomite is reported from two upper-amphibolite and granulite-facies, sapphirine-bearing, Al–Mg–Fe-rich and silica-poor lens-shaped layers within the Bamble Sector, south Norway. Primary assemblages, indicating peak metamorphic conditions of 773-844°C at 7 kbar (Mg–Fe exchange thermometry), are spinel–sapphirine–biotite–gedrite, spinel–corundum–sapphirine–cordierite and orthopyroxene–biotite–cordierite–plagioclase. Högbomite formed by hydrous alteration and oxidation of primary spinel and rutile and/or ilmenite according to the generalised reaction:Suggested conditions of högbomite formation are 550–620°C and 6–7 kbar. The högbomites contain 10.2–14.7 wt.% MgO, 04).3 wt.% ZnO, 58.9–62.1 wt.% Al2O3 and 15.6-17.6 wt.% Fe as FeO. The two högbomite may belong to different polytypes, as suggested by their differing TiO2 (9.9-10.1 versus 5.7–5.8 wt. %) and calculated Fe3+ – and H2O–contents. The partitioning of Zn between spinel and högbomite is not uniform and is considered to depend upon prevailing fo2 and aH2O. |
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