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Ertixiite (Na_2Si_4O_9), a new mineral found in a miarolitic cavity of the Altay pegmatite Mine,Xinjiang, China, is associated with topaz, apatite, quartz, cleavelandite, etc. The mineral is white,granular, and transparent. HNV=570.08-850.96 kg/mm~2 (Moh’s 5.8-6.5), D=2.35, N=1.502. Cubic system, a=5.975A, V=213.311A, Z=1, D_x=2.34g/cm~3. The chemical composition of ertixiite (the average of six samples) is: Na_2O 17.97, CaO 2.82,SiO_2 77.86, Al_2O_3 1.45, FeO 0.05, total 100.15. The strongest lines in the X-ray powder pattern are 3.443(2,111), 2.647(2.210), 2.674(2,210), 1.996(8,221), 1.798(10,311), and 1.492(2,400).
Ertixiite (Na_2Si_4O_9), a new mineral found in a miarolitic cavity of the Altay pegmatite Mine, Xinjiang, China, is associated with topaz, apatite, quartz, cleavelandite, etc. The mineral is white, granular and transparent. HNV = 570.08- 850.96 kg / mm 2 Moh’s 5.8-6.5 D = 2.35 N = 1.502 Cubic system a = 5.975A V = 213.311A Z = 1 Dx = 2.34 g / The strongest lines in the X-ray powder pattern are 3.443 (2,111), 2.647 (2.210), 0.647 (2.210) 2.674 (2,210), 1.996 (8,221), 1.798 (10,311), and 1.492 (2,400).