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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“Since the fall, God will not trust us with our own salvation, but it is both purchased and kept by Christ for us, and we for it through faith, wrought by the power of God.”
–Richard Sibbes, The Bruised Reed and Smoking Flax