Gruawacke or Grauwacke: How To spell?
The word Gruawacke is misspelled against Grauwacke, a noun meaning "Graywacke."
Word contains consecutive vowels 'AU' in between alphabets gr & wacke is misspelled as 'UA'Wrong Spelling:  gr-ua-wacke  Correct Spelling:  gr-au-wacke 
Check more misspelled words of Grauwacke to spell it correct.