Abstract
The multivariate statistical technique of principal component analysis can be of considerable aid to the mineralogist and petrologist in the preliminary screening of mineralogical chemical data. The processing of chemical analyses of biotites by principal component analysis revealed the properties of isomorphous or atomic substitution, paired or coupled substitution, and other relationships among the chemical elements. Common mineral contaminants can also be discovered and removed from the chemical data. The use of principal component analysis is advocated as a preliminary screening device to point out subtle relationships of mineralogical significance that should have a basis in petrological theory.
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