Strong’s Greek
G5472 — chalkedon
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
χαλκηδών
chalkedon — pronounced khal-kay-dohn'
from 5475 and perhaps 1491; copper-like, i.e. "chalcedony":--chalcedony. see GREEK for 5475 see GREEK for 1491
1 occurrence in the KJV.
Revelation 21:19
And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;