Crossword Genius

Older relative with thing mostly for hard rock (7)


I believe the answer is:


(Other definitions for granite that I've seen before include "Hard igneous rock", "Tangier (anag.)", "Hard stone from Tangier", "Igneous rock, generally composed of feldspar and mica and quartz", "Showing great resolution".)

I've seen this clue in The Telegraph.
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