Ключевые слова: agate, arabic, aragonite, ball, banded, brindle, brown, calcite, carnelian, chalcedony, fibrillar, fibrous, filamentary, gem, gift, green, jewel, marble, mineral, multicolor, natural, onyx, polished, precious, quartz, quartzose, quartzous, round, semiprecious, silica, sphere, spiritual, stone, streaky, striated, stringy, striped, tabby, white, yellow,