Moonstone. A nearly pellucid variety of feldspar, showing pearly or opaline reflections from within. The best specimens come from Ceylon. Their value is not much more than the expense of cutting.

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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