Crystalline rock
'crystalline rock' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for schist that I've seen before include "layered rock" , "Coarse-grained rock" , "Form of rock" .)
'crystalline rock' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for geode that I've seen before include "Druse" , "Small rock cavity" , "Crystal-lined cavity in rock" .)