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Art Chodos, California Institute of Technology, has examined several analyzed minerals for composition and homogeneity, using his routine microprobe techniques. The results demonstrate the well-known fact that gross chemical analyses are averages of the compositions of all the grains in a large sample, and should be extrapolated to individual grains with some reservation. Few mineral samples have the same composition throughout, and routine separation of an absolutely pure and homogeneous mineral sample is seldom achieved.
(1980), Vol. 4 No. 1 p. 139 HTML
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