Roughening

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From verrauhen occurs when a passage (geology) as he pursues in minerals is poorer and the deaf rock in relation to ore increases more and more.

Individual evidence

  1. ^ Herbert Stahl (editors), Gerhard Geurts , Hans-Dieter Hilden, Herbert Ommer , Siegfried Raimann: Das Erbe des Erzes, Volume 4, Der Lüderich , Bergisch Gladbach 2008, ISBN 3-932326-52-0 , glossary p. 251