Crossword Clue:

very hard coarse grained rock

We have found 2 answers to crossword clue "very hard coarse grained rock"
Best Answer: 6/10

Answer	Crossword Clue
GNEISS	Coarse-grained rock
SCHIST	Coarse-grained rock that splits easily

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.