Spinel. A mineral occurring in octahedrons of great hardness and various colors, as red, green, blue, brown, and black, the red variety being the gem spinel ruby, It consists essentially of alumina and magnesia, but commonly contains iron and sometimes also chromium. The fine specimens of spinel ruby are worth rather more than half as much as the diamond.

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“A gracious heart is contented by the melting of his will and desires into God's will and desires.”
–Jeremiah Burroughs, The Rare Jewel of Christian Contentment