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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

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1945-3027
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Volume 102, Issue 9

Issues

Refractive indices of minerals and synthetic compounds

Ruth C. Shannon / Barbara Lafuente / Robert D. Shannon / Robert T. Downs
  • Department of Geosciences, University of Arizona, 1040 East 4th Street, Tucson, Arizona 85721, U.S.A.
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Reinhard X. Fischer
  • Corresponding author
  • Universität Bremen, FB 5 Geowissenschaften, Klagenfurter Str. 2, and MAPEX Center for Materials and Processes, D-28359 Bremen, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-09-05 | DOI: https://doi.org/10.2138/am-2017-6144

Abstract

This is a comprehensive compilation of refractive indices of 1933 minerals and 1019 synthetic compounds including exact chemical compositions and references taken from 30 compilations and many mineral and synthetic oxide descriptions. It represents a subset of about 4000 entries used by Shannon and Fischer (2016) to determine the polarizabilities of 270 cations and anions after removing 425 minerals and compounds containing the lone-pair ions (Tl+, Sn2+, Pb2+, As3+, Sb3+, Bi3+, S4+, Se4+, Te4+, Cl5+, Br5+, I5+) and uranyl ions, U6+. The table lists the empirical composition of the mineral or synthetic compound, the ideal composition of the mineral, the mineral name or synthetic compound, the Dana classes and subclasses extended to include beryllates, aluminates, gallates, germanates, niobates, tantalates, molybdates, tungstates, etc., descriptive notes, e.g., structure polytypes and other information that helps define a particular mineral sample, and the locality of a mineral when known. Finally, we list nx, ny, nz, <nDobs> (all determined at 589.3 nm), <nDcalc>, deviation of observed and calculated mean refractive indices, molar volume Vm, corresponding to the volume of one formula unit, anion molar volume Van, calculated from Vm divided by the number of anions (O2−, F, Cl, OH) and H2O in the formula unit, the total polarizability <αAE>, and finally the reference to the refractive indices for all 2946 entries. The total polarizability of a mineral, <αAE>, is a useful property that reflects its composition, crystal structure, and chemistry and was calculated using the Anderson-Eggleton relationship αAE=(nD21)Vm4π+(4π3c)(nD21) where c = 2.26 is the electron overlap factor. The empirical polarizabilities and therefore, the combination of refractive indices, compositions, and molar volumes of the minerals and synthetic oxides in the table were verified by a comparison of observed and calculated total polarizabilities, <αAE> derived from individual polarizabilities of cations and anions. The deviation between observed and calculated refractive indices is <2% in most instances.

Keywords: Refractive index; electronic polarizabilities; optical properties; minerals; synthetic compounds; refractive-index calculation; Anderson-Eggleton relationship

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About the article

Received: 2017-03-20

Accepted: 2017-05-04

Published Online: 2017-09-05

Published in Print: 2017-09-26


Citation Information: American Mineralogist, Volume 102, Issue 9, Pages 1906–1914, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2017-6144.

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© 2017 by Walter de Gruyter Berlin/Boston.

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