Minor crag blasted for stone (9)

I believe the answer is:

cairngorm

'for stone' is the definition.
(type of quartz)

'minor crag blasted' is the wordplay.
'blasted' indicates an anagram.
'minor'+'crag'='minorcrag'
'minorcrag' anagrammed gives 'CAIRNGORM'.

(Other definitions for cairngorm that I've seen before include "Stone" , "mountains" .)

I've seen this clue in The Guardian.

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