close up view of a rock of crystalline magnetite (magnetite, iron ore) buried in quartz sand

magnetite black iron ore rock mineral quarto sand natural raw rough gemstone specimen material surface geological mineralogical macro closeup decorative background crystal crystalline metal geology industry metallic nature industrial hematite smelting quarry small detail hard development element shiny furnace piece tein environment ecology destruction danger pure open pit gold embedded white quartz close future mining wallpaper banner view buried