Blueberry is a trade-style name rather than a separate mineral species. Fluorite is calcium fluoride, CaF₂, and naturally occurs in blue, purple and many other colors. It can form cubes and octahedra as well as rounded or botryoidal aggregates.
Enjoying the detail
The collection photograph documents the material sold under this name. Its trade name alone does not specify a mine, treatment or chemical cause of color. Fluorite has Mohs hardness 4 and perfect cleavage, so protect it from knocks and abrasion.
