macro stone mineral diopside calcite magnetite on a white background

andradite background basalt black brown calcite chrysocolla collection corundum crystal diopside epidote ferruginous garnet gem gemstone geological geology graphite haematite hematite iron isolated itabirite lazulite limonite magnetite melanite mineral natural ore ornamental pebble piece pisolite prehnite rock set specimen spessartine spinel stichtite stone taconite tungstate white wolframite