Ключевые слова: agate, bright, chalcedony, collection, colored, colorful, crude, cut, decorative, end, finished, gem, gemmology, gemstone, geode, half, mineral, mineralization, mineralogy, mining, natural, onyx, pebble, prepared, raw, rock, rough, round, sawn, science, semi, semiprecious, sinter, specimen, stone, striped, stripy, surface, vivid, wild,