Idocrase. A mineral occurring in tetragonal crystals and also massive, of a brown to green color, rarely sulphur yellow or blue. It is a silicate of alumina and lime, with some iron and magnesia. It is common at Mt. Vesuvius.

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“God often bestows temporal prosperities on the wicked, to show how lightly he esteems what the world is so dazzled with; but crosses he reserves for his own, whom he would humble under his Almighty hand, and make them the objects of his delight.”
–Fenelon