Hydrothermal synthesis and morphology of Ga-bearing tourmaline

摘要

Ga-bearing tourmaline was originally synthesized in boron, boron-alkaline, and boron-fluorine hydrothermal solutions at a temperature of 600-650A degrees C and pressure of 100 MPa as crystals of spontaneous growth and on seeds. The maximal concentration of Ga2O3 in synthetic crystals reaches similar to 24.5 wt %. In addition to Ga-bearing tourmaline, Ga-bearing topaz crystallizes in boron-fluorine solution. Ga-bearing albite crystallizes in boron-alkaline solutions, whereas no additional phases are formed in pure boron solutions.