| Reference Type | Journal (article/letter/editorial) |
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| Title | Diffuse reflectance spectra and optical properties of some iron and titanium oxides and oxyhydroxides |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Strens, R. G. J. | Author |
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| Wood, B. J. | Author |
| Year | 1979 (September) | Volume | 43 |
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| Issue | 327 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_43/43-327-347.pdf+ |
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| DOI | doi:10.1180/minmag.1979.043.327.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3041 | Long-form Identifier | mindat:1:5:3041:4 |
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| GUID | 0 |
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| Full Reference | Strens, R. G. J., Wood, B. J. (1979) Diffuse reflectance spectra and optical properties of some iron and titanium oxides and oxyhydroxides. Mineralogical Magazine, 43 (327) 347-354 doi:10.1180/minmag.1979.043.327.06 |
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| Plain Text | Strens, R. G. J., Wood, B. J. (1979) Diffuse reflectance spectra and optical properties of some iron and titanium oxides and oxyhydroxides. Mineralogical Magazine, 43 (327) 347-354 doi:10.1180/minmag.1979.043.327.06 |
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| In | (1979, September) Mineralogical Magazine Vol. 43 (327) Mineralogical Society |
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| Abstract/Notes | SummaryThe reliability and utility of diffuse reflectance spectra are briefly but critically reviewed. The results of measurements of diffuse reflectance over the wavelength range 200 < λ < 2500 nm are reported for wüstite, magnetite, hematite, maghemite, ilmenite, ulvöspinel, and α-FeO · OH (goethite), β-FeO 7sd OH, γ-FeO · OH (lepidocrocite), and δ-FeO · OH. The spectra have been assigned by reference to simplified molecular-orbital energy-level diagrams derived from recent SCF-Xα calculations.The specular reflectances reported in the Quantitative Data File (Henry, 1977) are related to the diffuse reflectance spectra in a rational way. Minerals that absorb strongly throughout the visible display little dispersion of specular reflectance, and their powders are dark (wüstite, magnetite, ilmenite, ulvöspinel); those that absorb much more strongly in the near ultraviolet than in the visible have specular reflectances that decrease monotonically from blue to red according to a simple dispersion relation derived by combining the Sellmeier dispersion and Fresnel reflexion equations; their powders are strongly coloured (hematite, maghemite, lepidocrocite, goethite) and their optical anisotropy is closely related to crystal structure. |
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