Wacke
Pronunciation : Wack"e, Wack"y
Part of Speech : n.
Etymology : [G. wacke, MHG.wacke a large stone, OHG. waggo a pebble.] (Geol.)
Definition : Defn: A soft, earthy, dark-colored rock or clay derived from the alteration of basalt.
Source : Webster's Unabridged Dictionary, 1913