German: GrauwackenEnglish translation: greywacke 
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German to English translations [PRO]
Science - Geology / Geology | | German term or phrase: Grauwacken | Type of rock.
Eurodic is dowwn.
Plenty of Google hits, but no mention of the English equivalent.
More such later... |
| | | greywacke | Explanation:
My specialist field - education in geology and geotechnics |
| Selected response from:
 Alan Johnson
Germany
| Note from asker to answererThanks!
4 KudoZ points were awarded for this answer |
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The translation workplace 
peer agreement (net): +4