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.
From the co-author of the classic Jamieson, Fausset and Brown Commentary, Fausset's Bible Dictionary stands as one of the best single-volume Bible encyclopedias ever written for general use. The author's writing style is always clear and concise, and he tackles issues important to the average student of the Bible, not just the Biblical scholars. This makes Fausset an excellent tool for both everyday Bible study and in-depth lesson or sermon preparation.Wikipedia
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