Agate

"(Heb. shebo), a precious stone in the breast-plate of the high" "priest (Ex. 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 Isa." "54:12 and Ezek. 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. "This word is from the Greek name of a stone found in the river Achates in Sicily.