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1 Allotropes are forms of the same element which exhibit different physical properties. 2  Elements such as carbon, oxygen, phosphorus, tin and sulfur, display allotropy.
Tin makes up only about 0.001% of the earth's crust and is chiefly mined in Malaysia. Two allotropes of tin occur near room temperature. The first form of tin is called gray tin and is stable at temperatures below 13.2Â°C (55.76Â°F). There are few, if any, uses for gray tin.