The meaning of Agate in the Bible
(From Easton's Bible Dictionary)

(Heb. shebo), a precious stone in the breast-plate of the high priest (Exodus 28:19; 39:12), the second in the third row. This may be the agate properly so called, a semi-transparent crystallized quartz, probably brought from Sheba, whence its name. In Isaiah 54:12 and Ezekiel 27:16, this word is the rendering of the Hebrew cadcod, which means "ruddy," and denotes a variety of minutely crystalline silica more or less in bands of different tints.

See more on the meaning of Agate in the Bible:
Agate {International Standard Bible Encyclopedia}

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