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Strontium sulfate (SrSO 4) is the sulfate salt of strontium. It is a white crystalline powder and occurs in nature as the mineral celestine. It is poorly soluble in water to the extent of 1 part in 8,800. It is more soluble in dilute HCl and nitric acid and appreciably soluble in alkali chloride solutions (e.g. sodium chloride).
Celestine (the IMA-accepted name) [6] or celestite [1] [7] [a] is a mineral consisting of strontium sulfate (Sr S O 4). The mineral is named for its occasional delicate blue color. Celestine and the carbonate mineral strontianite are the principal sources of the element strontium, commonly used in fireworks and in various metal alloys.
Strontium commonly occurs in nature, being the 15th most abundant element on Earth (its heavier congener barium being the 14th), estimated to average approximately 360 parts per million in the Earth's crust [47] and is found chiefly as the sulfate mineral celestine (SrSO 4) and the carbonate strontianite (SrCO 3). Of the two, celestine occurs ...
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In the "black ash" process, celesite is roasted with coke at 1100–1300 °C to form strontium sulfide. [3] The sulfate is reduced, leaving the sulfide: SrSO 4 + 2 C → SrS + 2 CO 2. A mixture of strontium sulfide with either carbon dioxide gas or sodium carbonate then leads to formation of a precipitate of strontium carbonate. [4] [3]
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Often used in toy fireworks as a substitute for strontium. Orange Calcium chloride: CaCl 2: Orange Calcium sulfate: CaSO 4: High-temperature oxidizer. Excellent orange source in strobe compositions. Orange Hydrated calcium sulfate: CaSO 4 (H 2 O) x* The * indicates that the compound will burn orange where x=0,2,3,5. Gold/Yellow Charcoal powder ...