LYCOS RETRIEVER 
Strontium: Metals
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Strontium is a soft metal like lead and, when freshly cut, has a silvery lustre. It rapidly reacts in air to take on a yellowish colour; therefore, it is stored in kerosene. It does not occur free in nature. It composes about 0.04 percent of the crust of the Earth, especially as the minerals strontianite (SrCo3) and celestine (celestite; SrSO4).
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Strontium is a relatively heavy alkaline earth metal. Alkaline earth metals are of increasing reactivity with increasing atomic weight, with an average valence of +2, they ... react easily with Oxygen, to form rocksalts of geological importance.
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Strontium is found chiefly as celestite (SrSO4) and strontianite (SrCO3). Celestite is found in Mexico, Turkey, Iran, Spain, Algeria, and in the U.K. The U.S. has no active celestite mines. The metal can be prepared by electrolysis of the fused chloride mixed with potassium chloride, or is made by reducing strontium oxide with aluminum in a vacuum at a temperature at which strontium distills off.
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Strontium is found chiefly as celestite and strontianite. The metal can be prepared by electrolysis of the fused chloride mixed with potassium chloride, or is made by reducing strontium oxide with aluminum in a vacuum at a temperature at which strontium distills off. Three allotropic forms of the metal exist, with transition points at 235 and 540C.
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