| Reference Type | Journal (article/letter/editorial) |
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| Title | Pyrophanite from Chvaletice (Bohemia) |
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| Journal | Mineralogical Magazine |
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| Authors | Žák, L. | Author |
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| Year | 1971 (September) | Volume | 38 |
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| Page(s) | 312-316 | Issue | 295 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_38/38-295-312.pdf+ |
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| DOI | doi:10.1180/minmag.1971.038.295.04Search in ResearchGate |
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| Mindat Ref. ID | 6477 | Long-form Identifier | mindat:1:5:6477:8 |
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| GUID | 48726690-88aa-4bdd-9887-1bf7cc4868b0 |
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| Full Reference | Žák, L. (1971) Pyrophanite from Chvaletice (Bohemia) Mineralogical Magazine, 38 (295) 312-316 doi:10.1180/minmag.1971.038.295.04 |
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| Plain Text | Žák, L. (1971) Pyrophanite from Chvaletice (Bohemia) Mineralogical Magazine, 38 (295) 312-316 doi:10.1180/minmag.1971.038.295.04 |
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| In | (1971, September) Mineralogical Magazine Vol. 38 (295) Mineralogical Society |
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| Abstract/Notes | SummaryPyrophanite was found in quartz-rhodochrosite veins in hornstones of Algonkian pyritemanganese ores. Photometric reflectance falls from R0 24 and RE′ 19 at 405 mµ to R0 18 and RE′ 15% at 656 mµ (in air). Vickers microhardness (100 g load) demonstrates directional anisotropy, the average value is 611 kg/mm2. Besides the main constituents, subordinate to trace quantities of Mg, Si, Al, Ca, and Cu were recorded by a spectrographic analysis. Unit-cell dimensions are a = 5·131 and c = 14·27 Å. Electron-microprobe analysis gave MnO 43·3, FeO 3·8, MgO 0·05, TiO2 52·9, SiO2 0·1, total 100·15%. The origin of the Chvaletice pyrophanite was most probably connected with a hydrothermal metamorphism of an Alpine-paragenesis type. The source of elements was older sedimentary, basic volcanic, and metamorphic mineral assemblages. |
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