Crossword Genius

Silicate mineral (4)

Ross

I believe the answer is:

mica

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

This is the entire clue.

(Other definitions for mica that I've seen before include "Isinglass" , "Transparent mineral" , "Flexible mineral found in igneous and metamorphic rocks" , "Shiny silicate mineral" , "Semitransparent insulating mineral" .)

I've seen this clue in The Telegraph and The Times.
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