Celest, alternatively spelled cèlest, is a noun that refers to a rare mineral with the chemical formula SrSO4. This mineral belongs to the sulfate mineral group and is classified as a sulfate anhydrate. Celest is a variety of the mineral strontianite, which is composed of strontium carbonate. The term "celest" originates from the Latin word for "heaven," as the mineral’s pale blue color often resembles the sky on a clear day.
This mineral is distinguishable by its characteristic blue color, ranging from pale to sky blue, which stems from tiny amounts of divalent copper impurities. Celest usually occurs as tabular or prismatic crystals, often with distinctive flat terminations. It possesses a vitreous to pearly luster and has a Mohs hardness of around 3.5 to 4. Its specific gravity ranges from 3.97 to 4.03.
Celest is primarily found in sedimentary rocks and is commonly associated with deposits of barite, gypsum, calcite, and other sulfates. It can be found in various locations globally, such as Europe, North America, Africa, and Asia. Although not a widely utilized commercial mineral, celest often finds use in the manufacturing of ceramics, glass, and pigments due to its blue color.
Due to its rarity and aesthetic appeal, celest is also coveted by mineral collectors and enthusiasts who appreciate its delicate beauty and unique properties.
