Zektzerite: Gemstones Information

Zektzerite is NaLiZrSi6O15 and forms translucent colourless to pink,cream or white stout pseudohexagonal prisms of the orthorhombic system with two directions of perfect cleavage; the hardness is about 6 and the SG 2.79–2.80. The RI for the alpha, beta and gamma rays is 1.582, 1.584 and 1.584, biaxial negative (crystals nearly isotropic). There may be a light yellow fluorescence in SWUV though not in LW.Zektzerite occurs in a small number of miarolitic cavities in a riebeckite granite at Kangaroo Ridge, Washington Pass, Okanogan County, Washington, USA.