Sodalite crystal Photo by Violet Anderson Royal Ontario Museum Sodalite is a very widespread species at MSH, being one of the prime constituents of sodalite syenite. It fluoresces intense orange to orange-red under SW and LW and displays strong yellowish white phosphorescence for a short period. The hackmanite variety will fade with time, it will regain a darker shade when exposed to sunlight or ultraviolet radiation.
Color is usually colorless to pink, pale violet, pale to dark blue, violet.
Luster is vitreous to greasy or dull. Fracture is uneven to conchoidal. Hardness is 5.5 - 6. Streak is white.