Stone and basalt are different (9)
I believe the answer is:
alabaster
'stone' is the definition.
(I've seen this before)
'basalt are different' is the wordplay.
'different' indicates an anagram.
'basalt'+'are'='basaltare'
'basaltare' anagrammed gives 'ALABASTER'.
'and' is the link.
(Other definitions for alabaster that I've seen before include "Translucent white gypsum as found carved into ornaments" , "Altar base (anagr.)" , "Altar base (anag)" , "Stone often used for carving" , "medium of sculpture" .)