Turquoise. A hydrous phosphate or alumina containing a little copper. It has a blue, or bluish-green color, and usually occurs in kidney-shaped masses with a nodular surface, like that of a bunch of grapes. The fine specimens are worth nearly half as much as diamonds.

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“What a blessed condition is a true believer in! When he dies, he goes to God; and while he lives, everything shall do him good. Affliction is for his good. What hurt does the fire to the gold? It only purifies it.”
–Thomas Watson, A Divine Cordial