Quartz variety (5)
'quartz variety' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for agate that I've seen before include "Semi-precious stone" , "Ornamental form of quartz" , "Banded ornamental stone" , "Hard stone with concentric bands of colour" , "Variety of chalcedony" .)
'quartz variety' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for jasper that I've seen before include "Opaque reddish-brown semi-precious stone" , "stone used by jewellers" , "Semi-precious quartz stone -- boy's name" , "A man" , "Gemstone" .)