Crossword Genius

Colorful quartz variety (8)

Ross

I believe the answer is:

amethyst

(Other definitions for amethyst that I've seen before include "Purplish gemstone" , "Purple quartz used in jewellery" , "Transparent bluish quartz" , "Variety of quartz" , "Violet gemstone" .)

I've seen this clue in the LA Times.
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