Crossword Genius

Igneous rock (6)

Ross

I think it could be either:

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6

7

basalt

'igneous rock' is the definition.
(basalt is a kind of igneous rock)

This is the entire clue.

(Other definitions for basalt that I've seen before include "Commonest type of solidified lava; dense, dark grey and fine-grained" , "rock from 2 [VOLCANO]" , "Rock containing olivine" , "Dark rock of volcanic origin" , "Dark fine-grained volcanic rock" .)

I've seen this clue in the Evening Standard and The Independent.
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