Ключевые слова: aggregate, albite, alkali, aquamarine, beryl, beryllium, chalk, cluster, crystal, crystalline, crystals, feldspar, garnet, gem, gemology, gemstone, geological, geology, glass, glassy, granite, hydrothermal, lapidary, mineral, mineralogy, moonstone, nature, opaque, ore, pegmatite, plagioclase, quartz, rare, rare earth, rock, sample, silicate, sodium, specimen, spessartine, stone, transparent,