Shortite: Gemstones Information

Shortite is Na2Ca2(CO3)3 and forms characteristic transparent yellow wedge-shaped crystals of the orthorhombic system with hardness 3 and SG 2.60. The RI for the alpha, beta and gamma rays is 1.531–1.532,1.555–1.556 and 1.570, biaxial negative with birefringence 0.039.Shortite slowly decomposes in water and occurs in association with an intrusive alkalic gabbrio-syenitic complex at Mt Saint Hilaire, Quebec,Canada.