Celestine
Chemical Composition
Celestine (also called celestite) is a mineral consisting of strontium sulfate, with the chemical formula SrSO₄. It often forms beautiful blue crystals.
Origin and Location
Celestine is commonly found in sedimentary rocks. Major deposits of celestine can be found in places like the United States, Mexico, and Madagascar.
Uses and Applications
Celestine is used primarily as a source of strontium, which is used in fireworks, flares, and in the production of certain alloys.
History and Discovery
Celestine was discovered in the 18th century and is named after the Latin word "caelestis," meaning "heavenly," due to its sky-blue color.
Physical Properties
Celestine is a relatively soft mineral with a Mohs hardness of 3-3.5. It typically occurs in tabular or prismatic crystals and has a vitreous luster.
Formation Process
Celestine forms in sedimentary deposits, particularly in evaporite formations, where strontium-rich solutions crystallize out of water.
Optical Properties
Celestine is transparent to translucent and typically exhibits a pale blue to colorless appearance, with a vitreous luster.
Classification
Celestine belongs to the sulfates group. It is classified as a sulfate mineral with strontium being the dominant element in its chemical composition.
Interesting Facts
Celestine crystals can form in massive clusters or individual tabular forms. Some of the finest crystals come from Madagascar and Poland.
