A blue or colorless mineral made of strontium sulfate, often used as an ore of strontium.
From Latin coelestis (heavenly) because of its pale blue color resembling the sky. First scientifically described in 1797 and named for its celestial appearance.
This mineral got its name because early mineralogists thought its sky-blue color was so beautiful they named it after heaven itself—and it turns out to be perfect for making fireworks that create red flames.
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