Ключевые слова: abundant, beautiful, beauty, bright, brimstone, brittle, cobble, colorful, crystal, crystalline, decorative, excavated, gem, gemmology, gemology, gemstone, geological, geology, granular, habit, healing, jewelry, mine, mineral, multivalent, nature, nonmetallic, nugget, object, ore, ornamental, piece, precious, quarry, raw, rock, rough, sample, science, shine, shiny, smell, specimen, stone, sulfur, sulphur, transparent, volcanic, volcano, yellow,