Perovskite mineral oxides commonly exhibit extensive solid-solution, and are therefore classified on the basis of the proportions of their ideal end-members. A uniform sequence of calculation of the end-members i. ••Excel spreadsheet calculates perovskite end-member proportions i. Synthetic compounds and naturally-occurring minerals of the perovskite type adopt one of the most chemically-accommodating crystal structures known. Unlike many othe. The nomenclature of the perovskite supergroup – minerals that have, or that are derivative from, the aristotypic cubic perovskite crystal structure (Goldschmidt, 1926a, Lefkowitz. The Excel spreadsheet consists of four revealed worksheets:••Introduction worksheet that contains instructions and. From the references cited in section 2 above, 140 analyses were compiled in the Literature worksheet along with idealized data for 21 theoretical end-member compositions; thi.