Snakelike; mineral (10)

I believe the answer is:

serpentine

This clue is a double definition.

'snakelike' is the first definition.
(I know that snakelike can be written as serpentine)

'mineral' is the second definition.
(I've seen this before)

(Other definitions for serpentine that I've seen before include "Snake-like; mineral" , "London lake" , "like 21 [SNAKES]" , "Meandering" , "Dark green mineral" .)

I've seen this clue in The Times.

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