Getting it’s name from the Latin ‘caelestis’, meaning “heavenly”; an allusion to its color, celestite or celstine is a very popular mineral because of its typical sky blue or ‘celestial’ color. Often forming beautiful transparent light to medium-blue tabular crystals, celestite can be colorless, white, light red, green, blue, or brown. It is often found in colorful combinations with minerals such as yellow sulphur. Although celestite can look similar to barite, it is actually strontium sulphate, and has long been used as a source of strontium for fireworks, glazes and metal alloys. 
It forms in sedimentary rock such as limestones, dolomites, and sandstones. It can also be derived directly from sea water and commonly occurs in evaporate deposits as a minor constituent; occasionally it forms in hydrothermal deposits. The crystals take a wide variety of forms but are typically tablet, prism, or plate shaped. It can also form crusts, nodules, grains and masses. Celestite may also be found in the cavities of fossils. It is known to form, for example, in fossilized ammonites. It can be found in Madagascar, Mexico, Italy, Canada, England, and the US; lesser known specimens have been found in England, Slovakia, Austria, and Germany. 
Legend & Traditional PropertiesIn ancient Greece it was believed that the stone only worked if it had been given to its owner by a friend or relative. It would then protect the body from all kinds of evil. The ancient Romans were also familiar with the healing properties of celestite, its calming, fortifying influence on the mind and its ability to drive evil out of a person. The stone encourages the healing of wounds and is said to be effective in alleviating pain caused by tension, anxiety and in solving problems with insomnia. It is connected to both Capricorn and Gemini star signs.
Research from various crystal-mineral-rock websites & books.
