We compared the compositions of olivine, pyroxenes (enstatite and diopside), and accessory chrome spinellide from harzburgites collected in different areas of the two largest ophiolite massifs of the Urals, Kempirsai and Voykar-Synyin. Chromites of unique quality and resources have been mined in the Kempirsai massif for a long time. The Voykar-Synyin massif contains numerous chromite ore occurrences of various compositions. The geological structure, petrology, and mineralogy of these massifs have been considered in numerous publications [9, 11-14]. The samples for analysis were collected with account for the available data  on geological structures, chromite-bearing zones, and ore chromite deposits (Kempirsai massif) and were analyzed on the same apparatus.
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