Crossword Genius

Milky stone (4)

Ross

I believe the answer is:

opal

'milky stone' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for opal that I've seen before include "Milky-white gem" , "Milk-coloured gemstone" , "One in a ring perhaps" , "often semi-transparent" , "Lustrous stone" .)

I've seen this clue in the Penny Press, The Mirror, the King Feature Syndicate and The Star Tribune.
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