Crossword Genius

A blast shattered the rock (6)

Ross

I believe the answer is:

basalt

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

'a blast shattered' is the wordplay.
'shattered' is an anagram indicator.
'a'+'blast'='ablast'
'ablast' with letters rearranged gives 'BASALT'.

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

I've seen this clue in the Sydney Morning Herald.
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