Zircon. A material occurring in tetragonal crystals, usually of a brown or gray color. It consists of silicon, iron and zirconium, and is harder than the garnet. The transparent varieties are used as gems. The red variety is called Hyacinth; a colorless, pale yellow, or smoky-brown variety from Ceylon is called jargon.

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“Did Christ love you without any motive to draw His love, then will you not love Christ, in whom there are so many motives to draw your love?”
–Thomas Vincent, The True Christian's Love to the Unseen Christ