Ключевые слова: basalt, black, brown, close up, closeup, crystal, extrusive, gem, gemmological, gemmology, gemological, gemology, gemstone, geological, geology, gray, gray background, hematite, igneous, macro, material, mineral, mineralogical, mineralogy, natural, piece, polished, raw, rock, rolled, rough, sample, specimen, stone, tumbled, uncut, white, white background, white marble,