Ключевые слова: achatopal, ball, cacholong, cobble, collection, crystal, crystalline, decorative, fire, fire opal, gem, gemmology, gemology, gemstone, geological, geology, green, isolated, kacholong, kalmuck agate, kascholong, milky, mineral, natural, nature, opal, ore, ornamental, pebble, perlmutteropal, perlopal, piece, pink, polished, porzellanopal, raw, rock, sample, set, specimen, sphere, stone, transparent, tumbled, tumbling, various, white, white background, yellow,