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Mineral Commodity Summaries 2017 - USGS Mineral Resources .
Jan 19, 2017 . Stone. Asbestos. Germanium. Niobium. Strontium. Barite. Gold . U.S. Geological Survey, 2017, Mineral commodity summaries 2017: U.S. Geological .. domestic production and imports) was sold by crushers and grinders .. During 2016, China produced 66% of the world's graphite and consumed 35%.
Crusher - Wikipedia
A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. . The earliest crushers were hand-held stones, where the weight of the stone provided a boost to muscle power, used against a stone anvil.