Ключевые слова: big, black, brownishblack, compass, crystal, crystalline, decorative, fe3o4, ferric, ferromagnetic, formation, gemology, geology, gray, hematite, industry, iron, iron oxide, lodestone, magnet, magnetic, magnetite, massive, metal, metallic, metallurgy, metamorphic, mine, mineral, mineralogy, mining, nature, object, ore, oxide, pattern, pebble, quarry, quartz, raw, rock, rough, rust, sample, small, specimen, stone, texture, textured, white,