By far the most common strontium mineral, celestite closely resembles barite. It is used in the preparation of strontium nitrate for fireworks and tracer bullets and other strontium salts used in the refining of beet sugar. It was named in 1791 from the Greek word for "celestial", in allusion to the faint blue color of the original specimen.

Mineral Photos courtesy of R.Weller/Cochise College