chalcedony

Concise Bible Dictionary:

Blue Chalcedony

Strong’s Dictionary of Greek Words:

Greek:
χαλκηδών
Transliteration:
chalkedon
Phonic:
khal-kay-dohn’
Meaning:
from 5475 and perhaps 1491; copper-like, i.e. "chalcedony"
KJV Usage:
chalcedony

Jackson’s Dictionary of Scripture Proper Names:

copper-like: flower-like