Magnetic susceptibilities of orthopyroxenes in the Frantz Isodynamic separator

Frantz Isodynamic Separator was calibrated with substances of known magnetic susceptibilities. From the calibration graph, magnetic susceptibilities of the orthopyroxenes were deduced. The investigated orthopyroxenes ranged in composition from En₈₇Fs₁₃ to En₅₁Fs₄₉ and varied in magnetic susceptibilities from 12·18 to 54·49 × 10^?6 e.m.u./gram at 30° C. Magnetic susceptibilities were found to decrease with increase in the En content. A graph drawn with current strengths and the compositions of the orthopyroxenes shows a linear relationship between them.