What is the crossword answer for the clue: Fine-grained rock

SHALE - a 5 letter word may be the answer you are looking for!

SLATE - a 5 letter word may be the answer you are looking for!

BASALT - a 6 letter word may be the answer you are looking for!

CHERT - a 5 letter word may be the answer you are looking for!

Fine-grained rock

5 Character Answers:

CHERT

SHALE

SLATE

6 Character Answers:

BASALT