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)
Strong’s Dictionary of Greek Words:
Transliteration:
chrusoprasos
Phonic:
khroo-sop’-ras-os
Meaning:
from 5557 and πράσον (a leek); a greenish-yellow gem ("chrysoprase")