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Commercial grades of tin (99.8%) resist transformation because of the inhibiting effect of the small amounts of bismuth, antimony, lead, and silver present as impurities.
Alloying elements such as copper, antimony, bismuth, cadmium, and silver increase its hardness.
Simple eutectic systems, however, occur with bismuth, gallium, lead, thallium and zinc.
This large number of stable isotopes is thought to be a direct result of the atomic number 50, a "magic number" in nuclear physics.
Cassiterite is usually black or generally dark in color, and these deposits can be easily seen in river banks.
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Tin is often recovered from granules washed downstream in the past and deposited in valleys or the sea.Other forms of tin ores are less abundant sulfides such as stannite that require a more involved smelting process.
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