big gray raw pyrolusite mineral rock stone on white background.

raw specimen gneiss metamorphic rock stone isolated white background formed high-grade regional metamorphism solid collection mineral grains grow cemented rocks large small pebbles coal black ore geology carbon piece macro fuel crystal nature volcanic material natural fossil granite lava mining volcano metal basalt aphanitic fine-grained extrusive igneous big texture pattern wall textured surface brown marble concrete backgrounds rough closeup old gray grunge detail cork backdrop abstract foliated pyrolusite background