Crossword Genius

Crystal-lined rock (5)

Ross

I believe the answer is:

geode

'crystal-lined rock' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for geode that I've seen before include "Small rock cavity" , "Crystal-lined cavity in rock" , "Druse" .)

I've seen this clue in the Universal, the Penny Press and the Newsday.
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