Ключевые слова: abstract, background, close, congo, crystal, crystalline, decorative, gem, gemmology, gemology, gemstone, geological, geology, green, layer, macro, malachite, material, mineral, natural, nature, ornament, ornamental, pattern, plate, polished, rock, sample, shooting, slab, specimen, stone, structure, surface, texture, textured, tumbled, up, zaire,