Bible Dictionaries
Agate

Fausset's Bible Dictionary

Hebrew kadkod , from kadad , "to sparkle". The "windows" being of this gem (Isaiah 54:12) implies transparency. Gesenius thinks the ruby or carbuncle is meant. It was imported from Syria to Tyre (Ezekiel 27:16). Hebrew Sheba (from Sheba whence it came to Tyre), Exodus 28:19; Exodus 39:12, is rightly translated "agate," a semi-transparent uncrystallized quartz, mainly silica, with concentric layers of various tints; the second stone of the third row on the high priest's breast-plate. The English term is drawn from that of the Greeks, who found agate in the river Acheres, in Sicily, and hence named it.

Bibliography Information
Fausset, Andrew R. Entry for 'Agate'. Fausset's Bible Dictionary. https://www.studylight.org/​dictionaries/​eng/​fbd/​a/agate.html. 1949.