The Collaborative International Dictionary of English v.0.48:

Chrysoprasus \Chry*sop"ra*sus\, n. [L.]
   See Chrysoprase. --Rev. xxi. 20.
   [1913 Webster]

Easton's 1897 Bible Dictionary:

Chrysoprasus
   golden leek, a precious stone of the colour of leek's juice, a
   greenish-golden colour (Rev. 21:20).