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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“Surely he took up our infirmities and carried our sorrows, yet we considered him stricken by God, smitten by him, and afflicted.”
– Isaiah 53:4