Wacke

Wacke is a soft, earthy, dark-coloured rock or clay derived from the alteration of basalt.
Found on http://www.probertencyclopaedia.com/browse/HW.HTM

Wacke

A sandstone with 15 - 74% mud matrix per volume
Found on http://www.quartznall.co.uk/azhealthguide.htm

Wacke

• (n.) Alt. of Wacky
Found on http://thinkexist.com/dictionary/meaning/wacke/

wacke

sedimentary rock composed of sand-sized grains (0.063–2 mm [0.0025–0.078 inch]) with a fine-grained clay matrix. The sand-sized grains are frequently ... [4 related articles]
Found on http://www.britannica.com/eb/a-z/w/1
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