quartzite stone flake with cortical back on white background. stone age tools in mesolithic period or middle stone age.

rock soil geology produce carving dessert snack boulder brown art baking sculpture dish sand quartzite stone flake cortical back isolated white background age tools mesolithic period middle humans created four types pebble bifacial hand-axes blade stone rock isolated mineral white coal geology ore black macro nature granite carbon material crystal fuel object natural texture fossil close-up rough mining