Crossword Genius

Crystalline or vaporous element (6)

Ross

I believe the answer is:

iodine

(Other definitions for iodine that I've seen before include "Antiseptic found in seaweed" , "Element that can exist as a purple vapour" , "for therapeutic purposes" , "Black/violet element" , "Mild antiseptic" .)

I've seen this clue in The Times.
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