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Iron Ore Principal

The principal tin mineral is cassiterite, or tinstone SnO 2, a naturally occurring oxide of tin containing about 78.8 percent tin. Of less importance are two complex sulfide minerals, stannite Cu 2 FeSnS 4, a copper-iron-tin sulfide, and cylindrite PbSn 4 FeSb 2 S 14, a lead-tin-iron-antimony sulfide. These two

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