Celestine crystals. Crystals of the mineral celestine (celestite, strontium sulphate), a common mineral which forms crystals that can be colourless, milky white, pale blue or yellow. Celestine, which is mostly found in sedimentary rocks, is the main ore for strontium and its salts, and is used in making fireworks and flares (giving a crimson flame). It is also used in the nuclear industry, paint, electrical batteries, in the refining of beet sugar, and in the preparation of iridescent glass and porcelain.
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