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The results of the geological and mineralogo-technological studies of ultramafic rocks of pyroxene composition as a non-conventional high-Mg mineral raw material, exemplified by various Karelia?s deposits, such as Aganozero chromium ore, Buntin Hill dimension stone and Gaikolya base-mineral ores, are reported. High-Mg ultramafic rocks, such as olivinite, olivinite, dunite, peridotite and serpentinite, are of interest as mineral products on the world market. Pyroxenites are not used now practically in industry, but...