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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“God hath caused many wants and weaknesses in us that we may be useful to one another; and has purposely given a diversity of gifts and graces, that we may be helpful to each other.”
–The Works of George Swinnock