Ключевые слова: biotite, black, blue, brown, closeup, collection, crystal, crystalline, cyanite, decorative, disthene, druse, gemmological, gemmology, gemological, gemology, gemstone, geological, geology, gneiss, kyanite, macro, marble, material, matrix, mineral, mineralogical, mineralogy, natural, object, ornamental, piece, pink, raw, rock, rough, sample, semiprecious, specimen, stone, structure, surface, texture, unpolished, white, white background, white marble,