Celestite (SrSO4) is strontium sulfate, but barium substitutes freely for strontium in the structure occasionally. Celestite forms in sedimentary rock such as limestones, dolomites, and sandstones, and may also be precipitated directly from sea water. It also occasionally occurs in hydrothermal deposits. Fine specimens come from Madagascar, Mexico, Italy, Canada, and the US.


Along with strontianite, celestite is the principle source of strontium, which is used to create the red color in fireworks, signal flares, and tracer bullets.


The name derives from the Latin caelestis, "of the sky," in allusion to the mineral's blue color. It is also known as celestine.


Metaphysically Known For: Angelic communication, access to higher dimensions, serenity.