lava rock covered in monoclinic sulphur crystals on a black reflective surface. from eruption of mount etna in 2001

monoclinic italy lava magma mineral mining molten natural pumice reflect reflection resource rock rough science solidify stone strange surface volcano vulcanism igneous yellow geological sulfur sulphur basalt black collect colorful earth fragile geology encrusted eruption cooled macro curious formation closeup deposit colour europe intricate orange etna delicate