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Chemical analysis Color sio2 al2o 3fe2o3mnomgocao Grey35-4018--200.9-1.00.5-2.00.2-1.42.2-3.9 Physical characteristics Basic mineralsio2, al2o3 Colourbrown, red Density3.90g/cm3 min Mohs hardness7.4-8.0 1 mt in a jumbo bag
