Fluorite

Fluorite is a common and widely-distributed fluorescent mineral that was discovered in 1529. The name comes from the Latin flure meaning "to flow". It is found as a common gangue mineral in hydrothermal veins, especially those of lead and silver, and is associated with hot springs deposits. It is used as a flux in steel-making and as a source of fluorine.

Mineral Photos courtesy of R.Weller/Cochise College