Fluorite. Calcium fluoride, a mineral of many different colors, white, yellow, purple, red, etc., often very beautiful. When crystallized it is commonly in cubes with perfect octahedral cleavage. Some varieties are used for ornamental vessels. Also called fluorspar, or simply fluor. The colored varieties are often called false ruby, false emerald, false topaz, false sapphire, and false amethyst. For jewelry purposes the chief value of the stone is the expense of cutting and mounting.

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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