| Reference Type | Journal (article/letter/editorial) |
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| Title | Origin of optical pleochroism in orthopyroxenes |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Burns, Roger G. | Author |
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| Year | 1966 (March) | Volume | 35 |
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| Issue | 273 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_35/35-273-715.pdf+ |
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| DOI | doi:10.1180/minmag.1966.035.273.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5947 | Long-form Identifier | mindat:1:5:5947:7 |
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| GUID | 0 |
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| Full Reference | Burns, Roger G. (1966) Origin of optical pleochroism in orthopyroxenes. Mineralogical Magazine and Journal of the Mineralogical Society, 35 (273) 715-719 doi:10.1180/minmag.1966.035.273.06 |
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| Plain Text | Burns, Roger G. (1966) Origin of optical pleochroism in orthopyroxenes. Mineralogical Magazine and Journal of the Mineralogical Society, 35 (273) 715-719 doi:10.1180/minmag.1966.035.273.06 |
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| In | (1965) Mineralogical Magazine Vol. 35 (273) Mineralogical Society |
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| Abstract/Notes | SummaryThe necessary conditions for optical pleochroism in orthopyroxenes are: ordering of Fe2+ ions, with preferential occupation of M2 positions; presence of small, high-valence cations (Al3+, Fe3+, Ti4+) in M1 positions; replacement of Si by Al; and a sufficient Fe2+ content. These factors favour an intensification of the charge-transfer absorption bands in the ultra-violet that is more marked for the α vibration direction than for β and γ. This leads to absorption in the blue and a red colour in transmitted α-polarized light, while β and γ, remain green. |
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