Colourless transparent quartz (7)

I believe the answer is:

crystal

'colourless transparent quartz' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for crystal that I've seen before include "The fortune teller may use a . . . . . . . ball" , "Type of clear-cut, lucent glass" , "Very clear glass" , "Clear mineral, eg, quartz" , "Globe for the fortune-teller" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).

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