TY - JOUR
T1 - Refractive indices of minerals and synthetic compounds
AU - Shannon, Ruth C.
AU - Lafuente, Barbara
AU - Shannon, Robert D.
AU - Downs, Robert T.
AU - Fischer, Reinhard X.
N1 - Publisher Copyright:
© 2017 by Walter de Gruyter Berlin/Boston.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - 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, Dobs> (all determined at 589.3 nm), Dcalc>, 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=(nD2-1)Vm/4π+(4π/3-c)(nD2-1) 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.
AB - 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, Dobs> (all determined at 589.3 nm), Dcalc>, 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=(nD2-1)Vm/4π+(4π/3-c)(nD2-1) 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.
KW - Anderson-Eggleton relationship
KW - Refractive index
KW - electronic polarizabilities
KW - minerals
KW - optical properties
KW - refractive-index calculation
KW - synthetic compounds
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U2 - 10.2138/am-2017-6144
DO - 10.2138/am-2017-6144
M3 - Article
AN - SCOPUS:85029394324
SN - 0003-004X
VL - 102
SP - 1906
EP - 1914
JO - American Mineralogist
JF - American Mineralogist
IS - 9
ER -