Ключевые слова: biotite, birthstone, borosilicate, crystal, crystalline, crystallisation, crystallization, crystallography, diagenesis, dioxide, gem, gemology, gemstone, geological, geology, geomorphology, green, igneous, inclusion, inorganic, jewel, lapidary, macro, macrocrystalline, matrix, metamorphic, mineral, mineralized, mineralogy, pegmatite, petrology, precious, rare, raw, rock, rough, semiprecious, silicate, silicon, silicon dioxide, sio2, starstone, tourmaline, translucent, transparent, turmalin, turmaline, unpolished, verdelite, vitreous,