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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“Two things are necessary to the life of pure faith. The first is, that we behold God alone, under all the imperfect coverings that conceal him; the second is, constantly to have our souls kept in a state of dependence.”
–Fenelon