aggregate of dark coarse gray stones crushed at a stone pit - gravel pattern

abstract aggregate backdrop background ballast boulder boulders broken chippings close closeup coarse construction cracked crushed crusher dark design flat floor formless fragment fragments graded granite gravel gray grey grit grunge heap heavy industrial industry irregular loose macadam macro material mine mineral natural path pattern pebble pebbles pieces pile piled pit quarry raw refracted road rock rocks rocky rough round rubble shapes shingle size sizes small stack stacked stone stonepit stones stony structure structured surface texture textured unformed wall wallpaper