| Reference Type | Journal (article/letter/editorial) |
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| Title | The iron content and optic axial angle in zoisites from Galicia, NW Spain |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Maaskant, P. | Author |
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| Year | 1985 (March) | Volume | 49 |
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| Issue | 350 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_49/49-350-97.pdf+ |
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| DOI | doi:10.1180/minmag.1985.049.350.14Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3703 | Long-form Identifier | mindat:1:5:3703:1 |
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| GUID | 0 |
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| Full Reference | Maaskant, P. (1985) The iron content and optic axial angle in zoisites from Galicia, NW Spain. Mineralogical Magazine, 49 (350) 97-100 doi:10.1180/minmag.1985.049.350.14 |
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| Plain Text | Maaskant, P. (1985) The iron content and optic axial angle in zoisites from Galicia, NW Spain. Mineralogical Magazine, 49 (350) 97-100 doi:10.1180/minmag.1985.049.350.14 |
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| In | (1985, March) Mineralogical Magazine Vol. 49 (350) Mineralogical Society |
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| Abstract/Notes | AbstractElectron probe microanalyses of zoisites from high-grade metamorphic rocks in Galicia, NW Spain have been obtained. The elements Na, Mg, P, K, Ti, and Mn were not detected above the 0.1 wt. % level. Assuming all Fe is present as Fe3+, a clear relation is obtained between the Fe content and the optic axial angle. Zoisite with 1.6 wt. % Fe2O3 proves to be uniaxial at 589 nm; uniaxiality in blue light (470 nm) lies at 1.5 wt. % Fe2O3. A change of the optic sign, from positive to negative, is obtained at 2.9 wt. % Fe2O3. The presence of minor elements greatly affects this relation, as is indicated by analyses of sector-zoned Sr-bearing zoisites of a muscovite-zoisite pegmatite from the same region. Under retrograde conditions Fe-rich α-zoisite reacts to form less Fe-rich α-zoisite or β-zoisite and clinozoisite. |
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