Banded stone (4)
'banded stone' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for agate that I've seen before include "Banded ornamental stone" , "On the way" , "Ornamental form of quartz" , "Impure form of quartz with banded chalcedony, used as a gemstone" , "Semi-transparent stone" .)
'banded stone' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for onyx that I've seen before include "Form of chalcedony" , "Form of agate" , "Kind of agate" , "Quartz used as a gem" , "Gemstone, a variety of chalcedony" .)