Opal. A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. The precious opal shows a peculiar play of colors of delicate tints and is highly esteemed as a gem. One kind, with a varied play of color in a reddish ground, is called harlequin opal. The fire opal (which comes from Mexico) has colors like the red and yellow of flame.

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“A saint cannot do evil before men but he gives opportunity for sinners to speak evil of God. If there be any spots on a Christian's coat, the world will soon spy them.”
–George Swinnock in Works