The green precious stone which was one of twelve on the high priest's breast-piece (Exod. 28: 20), and in Rev. 21: 20 the mineral beryl forms the eighth of the foundation stones of the wall of the New Jerusalem.
Citation for beryl
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"beryl." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. May 23, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e261>.
Chicago
"beryl." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e261 (accessed May 23, 2013).