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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“Christ was like us in our nature, but not in our blemishes; he had our flesh, but without the least stain of imperfection; he had the likeness of sinful flesh, but there was not any sin in him.”
–Stephen Charnock, Discourses on Christ Crucified