Cat's-eye. A variety of quartz or chalcedony exhibiting opalescent reflections from within, like the eye of a cat. The name is given to other gems affording like effects, especially the chrysoberyl.

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“Hope in this life is a perishing thing, but the hope of good men, when it is cut off from this world, is but removed like a tree, transplanted from this nursery to the garden of the Lord.”
–Matthew Henry, Commentary, Job 19