Ключевые слова: aggregate, artifact, background, black, bohemia, cluster, crystal, crystalline, dioxide, gem, gemmy, gemstone, geology, glass, glassy, green, hyalite, hydrothermal, isolated, jalite, matrix, mine, mineral, mineralogy, mullers, natural, nature, opal, ore, pegmatite, precious, raw, resource, resources, rock, rough, sample, sherl, silica, silicate, silicon, smokey quartz, specimen, stone, tourmaline, transparent, treasure, unprocessed, valec,