Crossword Genius

Crystal-lined stone (5)

Ross

I believe the answer is:

geode

'crystal-lined stone' 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 "Crystal-lined cavity in rock" , "Druse" , "Small rock cavity" .)

I've seen this clue in The Wall Street Journal.
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