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Gallium and Germanium Substitutions in Synthetic Feldspars

Julian R. Goldsmith
The Journal of Geology
Vol. 58, No. 5, Feldspar Issue (Sep., 1950), pp. 518-536
Stable URL: http://www.jstor.org/stable/30068568
Page Count: 21
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Gallium and Germanium Substitutions in Synthetic Feldspars
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Abstract

Compounds of gallium and germanium isostructural with the feldspars have been prepared, and some of their crystal-chemical properties are here described. In the Na and K feldspars, $Al^{+++}$ and $Si^{++++}$ can be completely replaced by $Ga^{+++}$ and $Ge^{++++}$; but, in pure Ca feldspar, complete substitutions cannot be made. The use of these substitutions as a means of obtaining information on the feldspars is discussed. One of the principal aims of this line of investigation is to obtain information on substitutional disorder in alumino-silicates. It is difficult to locate specific positions of Al and Si atoms in many silicates because of the approximately equivalent X-ray scattering power of these two atoms. The use of a heavier-element replacement should produce more definite information on the degree of substitutional disorder, and it is hoped that these Ga and Ge feldspars will help in the interpretation of some of the problems of the natural minerals.

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