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Tin grit:The component is that SnO2,is colourless seldom see extremely,contains the niobium,tantalum,iron because of Chang,prepare a manganese but assume the dark brown sum drop form color,the striation containing a wolfram but assuming the wax yellow,the deep dead colour cassiterite assumes a sandy beige.Buddha's warrior attendant lustre,fracture section fat lustre,transparency follow colour but different,be that semi-transparency assumes the grit shape till the opacity mostly.The tin grit is to refine the mainest tin raw material.

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