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Kitto's Popular Cyclopedia of Biblical Literature
Our word Jasper is plainly from the Greek jaspis, which comes from the Hebrew word yashpeh. Jasper is a species of the quartz family, and embraces a great many varieties. The brown Egyptian variety was perhaps the one selected for the breastplate of the high-priest (; ). The brown is of various shades, disposed in concentric stripes. It occurs loose in the sands of Egypt, and is cut into ornaments.
Kitto, John, ed. Entry for 'Jasper'. "Kitto's Popular Cyclopedia of Biblical Literature". https://www.studylight.org/encyclopedias/eng/kbe/j/jasper.html.