Ключевые слова: arsenic, background, close, collection, crystal, crystalline, decorative, dolomite, druse, gem, gemmological, gemmology, gemological, gemology, gemstone, geological, geology, gray, isolated, little, macro, material, mineral, mineralogy, native, natural, nature, nugget, object, ore, ornamental, orpiment, pebble, piece, raw, rock, rough, sample, shooting, small, specimen, stone, structure, surface, texture, textured, up, white, yellow,