Wacke
Wacke , noun
[German wacke, Middle High German wacke a large stone, Old High German waggo a pebble.]
(Geology) A soft, earthy, dark-colored rock or clay derived from the alteration of basalt.
Also: Wacky
Wacke , noun
[German wacke, Middle High German wacke a large stone, Old High German waggo a pebble.]
Also: Wacky