Crossword Genius

Colorful banded rocks (6)

Ross

I believe the answer is:

agates

(Other definitions for agates that I've seen before include "Pieces of impure quartz used as gemstones" , "Hard coloured stones from a stage" , "marbles" , "Set aga up for shiny stones" , "Ornamental stones" .)

I've seen this clue in The New York Times.
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