magnetite iron ore texture close-up. contains magnetit, pyrite, calcite, magnesioferrite, spinel, fluorite

allocation alloy background bornite calcite crystal fluorite gem gemstone geological geology golden industry iron macro magnesioferrite magnetite material metal metallic mine miner mineral mineralogy mining natural nature nugget ore polymetallic precious pyrite quartz rare raw resource rock science shaft siberia silica specimen spinel sulfide surface