Ключевые слова: adularescence, adularia, background, bead, beautiful, blue, cabochon, close, collection, crystal, crystalline, feldspar, gem, gemmology, gemology, gemstone, geological, geology, isolated, luster, lustre, macro, material, mineral, moonstone, natural, nature, object, opalescent, ornamental, pebble, piece, polished, rock, sample, semiprecious, sheen, shine, shiny, shooting, small, specimen, stone, structure, surface, texture, transparent, up, white,