Abstract
The Gladstone–Dale relationship, developed by Gladstone and Dale (1884), is a mathematical term which relates to the indices of refraction, the density and the chemical composition. Larson (1921) asserted that this rule can be applied to crystalline substances. The aim of the relationship is to receive the compatibility index (CI) for a mineral. Hence, information about the specimens such as chemical composition, indices of refraction and density is needed. Combining Eqs. (1.1) and (1.2), the Gladstone–Dale CI in Eq. (1) is obtained. The components of Eqs. (1), (1.1) and (1.2) are listed in Table 1.
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