black marble basalt abstract background onyx coal frozen lava tube crag texture rippled circle stone dirt night burnt knotted wood

textured effect black color background marble rock marbled stone object material gemstone coal wood white abstract luxury obsidian mining natural resources backgrounds crude oil lava volcanic slate liquid burnt mountain onyx wave pattern marbling plant bark rough ember ash cracked swirl basalt eroded shape face granite night burning close layered geode flowing fault geology agate curve meteor crater spill soot square composition striped weathered aa hills dirty distressed photographic grunge technique cave people pahoehoe social issues usa