Diopside. A crystallized variety of pyroxene (a silicate of lime and magnesia), of a clear, grayish green color; also called mussite.

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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