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Index of proportionality of atomic weights of chemical elements is proposedfor determining the relative age of minerals and rocks. Their chemical analysisresults serve to be initial data for calculations. For rocks of differentcomposition the index is considered to be classification value as well. Crystallattice energy change in minerals and their associations can be measured by theindex value change, thus contributing to the solution of important practicalproblems. There was determined the effect of more rapid increase of potentialenergy of limestone with relatively low lattice energy as compared with theothers.

Relative Dating and Classification of Minerals and Rocks Based on Statistical Calculations Related to Their Potential Energy Index