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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“Do all thou doest as unto Christ, as immediately dealing with Christ Jesus, as if he were looking on thee, and though on him, and fetch all thy strength from him.”
–Thomas Wilcox, A Choice Drop of Honey