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Wood, B. J., Strens, R. G. J. (1979) Diffuse reflectance spectra and optical properties of some sulphides and related minerals. Mineralogical Magazine, 43 (328) 509-518 doi:10.1180/minmag.1979.043.328.11

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Reference TypeJournal (article/letter/editorial)
TitleDiffuse reflectance spectra and optical properties of some sulphides and related minerals
JournalMineralogical MagazineISSN0026-461X
AuthorsWood, B. J.Author
Strens, R. G. J.Author
Year1979 (December)Volume43
Issue328
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_43/43-328-509.pdf+
DOIdoi:10.1180/minmag.1979.043.328.11Search in ResearchGate
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Mindat Ref. ID3074Long-form Identifiermindat:1:5:3074:2
GUID0
Full ReferenceWood, B. J., Strens, R. G. J. (1979) Diffuse reflectance spectra and optical properties of some sulphides and related minerals. Mineralogical Magazine, 43 (328) 509-518 doi:10.1180/minmag.1979.043.328.11
Plain TextWood, B. J., Strens, R. G. J. (1979) Diffuse reflectance spectra and optical properties of some sulphides and related minerals. Mineralogical Magazine, 43 (328) 509-518 doi:10.1180/minmag.1979.043.328.11
In(1979, December) Mineralogical Magazine Vol. 43 (328) Mineralogical Society
Abstract/NotesSummaryThe results of measurements of diffuse reflectance over the wavelength range 200 < λ < 2500 nm are reported for sphalerite, cinnabar, alabandite, chalcopyrite, bornite, orpiment, stibnite, bismuthinite, enargite, and pyrargyrite, and for eight pyrite-type and four NiAs-type compounds. Some spectral assignments have been made.Optical properties are related to the absorption spectrum (and through this to composition and structure) in a rational way. Absolute reflectances tend to increase with mean atomic number (z) through the operation of the ‘z-sum rule’, and at constant z they decrease as the band gap increases. Bireflectance is structurally controlled, being weak in derivatives of the cubic sphalerite and pyrite structures, moderate in derivatives of wurtzite and NiAs, and strong in anisodesmic structures such as that of stibnite. Extreme bireflectance occurs in anisodesmic structures with strong dichroic absorption bands in the visible (molybdenite, covelline).The dispersion of reflectance (dR/dλ) depends on the position of the centre of the main absorption envelope in relation to the visible spectrum. For λ > , dispersion is normal (Rblue > Rred, dR/dλ negative), the streak is light or coloured, and polished surfaces tend to be bluish. For λ < , dispersion is reversed (Rred > Rblue), the streak is dark, and polished surfaces are yellowish. Polished surfaces are white or grey if absorption varies little through the visible or strongly coloured if it varies rapidly (covelline, chalcopyrite).


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