Chrysoprasus

Boyd’s Bible Dictionary:

(golden leek). An apple-green variety of chalcedony (Rev. 21:20).

Concise Bible Dictionary:

Supposed to be a variety of Chalcedony of a green shade (Rev. 21:20). The word χρυσόπρασος does not occur in the LXX.
Chalcedony (var. Jasper)

Jackson’s Dictionary of Scripture Proper Names:

golden green: golden achievement