CORUNDUMChemical properties: the corundum is composed of pure. alumina; its colouring is due to metallic oxide traces or inclusions. The color of sapphire, due to iron.corundum sapphire crusher machine reserved,How to Identify Precious Stones - 911 MetallurgistMay 16, 2017 . Corundum, sapphire, and ruby are found in gneiss, granite, mica slate, chlorite slate, dolomite, or granular line. In Ceylon precious stones.THE EMPOWERMENT OF TANZANIAN WOMEN THROUGH .economically important coloured gemstones are the corundum varieties ruby and sapphire, emeralds and in the African context, tanzanite; other gemstones of interest are . more organised and includes the use of machinery. ... Inhalation of fine, crystalline silica dust, generated from breaking and crushing rock, can.
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