Ключевые слова: background, black, calcite, close, cobble, collection, crystal, crystalline, dark, gem, gemmology, gemology, gemstone, geological, geology, iceland, isolated, jewelry, krasnoyarsk, little, macro, material, mineral, mining, natural, nature, object, ore, ornamental, piece, precious, raw, region, rock, russia, sample, semiprecious, shooting, silfurberg, silverrock, small, spar, specimen, stone, structure, surface, textured, transparent, up, white,