Ключевые слова: aggregate, amethyst, blue, calcium, cluster, complex, crystal, crystalhealing, crystalline, cube, cubic, erongo, fluorescent, fluoride, fluorine, fluorite, fluoritequartz, fluorspar, gem, gemmy, gemstone, geology, glass, glassy, healing, hydrothermal, inclusion, industry, matrix, mineral, mineralogy, minerals, naturaltherapy, octahedral, ore, pegmatite, precious, quartz, rosecrystal, rosequartz, semiprecious, specimen, stone, transparent, uncut,