Fluorite - Calcite

CaF2  and  CaCO3 - Mohs Hardness: 3 - 4.  In 1852, George Gabriel Stokes discovered the ability of specimens of fluorite to produce a blue glow when illuminated with light, which in his words was "beyond the violet end of the spectrum." He called this phenomenon "fluorescence" after the mineral fluorite.
Abstract/Description: CaF2 and CaCO3 - Mohs Hardness: 3 - 4. In 1852, George Gabriel Stokes discovered the ability of specimens of fluorite to produce a blue glow when illuminated with light, which in his words was "beyond the violet end of the spectrum." He called this phenomenon "fluorescence" after the mineral fluorite.
Subject(s): New York, United States
environmental sciences