Fluorite
WordNet
noun
(1) A soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine
WiktionaryText
Noun
- A widely occuring mineral (calcium fluoride), of various colours, used as a flux in steelmaking, and in the manufacture of glass, enamels and hydrofluoric acid.
- Fluorite is the main natural resources of Thailand.