Topaz Chemical: Al2SiO4(F,OH)2. Clades: Al2SiO5 group; Nesosilicates; Silicate minerals; Lapidae. rom Related postsCalcium fluoratumJuly 15, 2022Bartsia alpinaMarch 10, 2019Pentas lanceolataMarch 10, 2019 Previous postKyaniteNext postNorbergite