Central Research and Development, Experimental Station 356/329
E.I. Du Pont de Nemours
Wilmington, DE 19880-0356, USA
George R. Rossman
Division of Geological and Planetary Sciences
California Institute of Technology
Pasadena, CA 91125, USA
topaz
orthoclase
scapolite
The deviation (C) between measured dielectric polarizabilities as determined from the Clausius-Mosotti equation and those calculated from the sum of ion polarizabilities according to aD(mineral)=SaD(ions) for topaz is 2.5%. The large deviations of orthoclase and scapolite from the oxide additivity rule with A = +7.2 and 1992), ± 17.6%, respectively, are attributed to "rattling" ions in orthoclase and "rattling" (Na,K,Ca) ions and disordered O= and Cl ions in scapolite.
K'a =6.61 tan 6=0.0005
K'b = 6.82 tan 6=0.0007
K'c =6.81 tan 6=0.0007
K'a =4.69 tan 6=0.0007
K'b = 5.79 tan 6=0.0007
K'c =5.63 tan 6=0.0011
K'11=4.72
K22=5.79
K'33= 5.76
K'a = 6.74 tan 6=0.0004
K'c =8.51 tan 6=0.0004