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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“If God give thee not only earth but heaven, that thou shouldest rule over sun, moon, and stars, and have rule over the highest of the sons of men, it would not be enough to satisfy thee, except thou hadst God himself.”
–Jeremiah Burroughs, The Rare Jewel of Christian Contentment