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mineral hardness iron ore gold ore extraction equipment

BASE METAL ORES . 14. IRON ORE 15 COPPER ORE 16 . PRECIOUS METAL ORE . 17. GOLD ORE 18. ROCKS AND INDUSTRIAL MINERALS . 19. GYPSUM 21 LIMESTONE 22 MARBLE 23 SALT 24 ZEOLITE 25 . ... a popular way of determining hardness because it requires no special equipment. Hardness based on scratch testing was given a precise definition in 1822 by the

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