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Origin and history of wacke
wacke(n.)
a soft rock resulting from decomposition of volcanic material, 1803, wacca, from German Wacke, from Middle High German wacke "large stone, rock projecting from the surface of the ground," from Old High German wacko, waggo "gravel, pebble, rock rolling in a riverbed." This probably is from Old High German wegan "to move" (from Proto-Germanic *wag- "to move about," from PIE root *wegh- "to go, move"). A miner's word brought into geology by German geologist Abraham Gottlob Werner (1750-1817).
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