Leucophanite: Gemstone Information

Leucophanite is (Ca,Ce)CaNa2Be2Si4O12(F,OH)2 and forms semitransparent light yellow to light green short prismatic to tabular pseudo tetragonal crystals of the orthorhombic or triclinic systems with one direction of perfect cleavage, hardness 3.5–4 and SG 2.96–4.07. The RI for the alpha, beta and gamma rays is 1.565–1.573, 1.590–1.595 and 1.593–1.598, biaxial negative, birefringence 0.028. A pink fluorescence under LWUV and a green response to SW have been reported.Leucophanite occurs at Mt Saint Hilaire, Quebec, Canada.