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Strontium occurs naturally in the minerals celestite and strontianite. The 90Sr isotope is present in radioactive fallout and has a half-life of 28.90 years. Due to its extreme reactivity to air, this element occurs naturally only in compounds with other elements, as in the minerals strontianite, celestite, etc. Strontium is isolated as a yellowish metal and is somewhat malleable. Strontium is chiefly employed (as in the nitrate) to color pyrotechnic flames red.

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