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Mineral Processing Nickel Ore

201998to test the presence of nickel in a mineral, by means of the blowpipe, requires great caref heated on charcoal, together with carbonate of soda in the inner flame, a grey metallic powder, attractable by the magnet, is formedf heated with borax on platinum wire in the outer frame, a hyacinth red to violet brown glass results when hot, a yellowish or yellowish red when cold.