Fluorspar

Flour : fluores (Agricola.) 1546; fluorite; Derbyshire spar ; Blue John ; Flusspath )Germ.), Chaux fluatee (Fr.), Fluorine (Fr.), fluorina, spato fluore (It.), espato fluor (Sp.), marmor metallicum (Lat.),

Chlorophane is a name that was given to green-phophorescent fluorite in the belief that it was a distinct mineral.

The name fluorspar is derived from fluere, to flow, in allusion (a) to a property that readily distinguishes it from other gemstones, and (b) to its use as a flux. The term fluorescence is derived from the mineral because it exhibits the property to a marked degree. "Fluorspar" is often used to refer to the commercial product, and "fluorite" to the mineral.