aggregate of 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 flat floor formless geological geology graded granite gravel gray grey grit heap industrial industry irregular light little loose macadam material mine mineral monotone natural path pattern pebble pebbles pieces pile piled pit quarry raw refracted road rock rocks rocky rough round rubble shape shapes shingle size sizes small stack stacked stone stonepit stones stony structure structured surface texture textured unformed wall wallpaper