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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“At the least whosoever has the spirit of Christ, shall find that spirit in him striving against that which is contrary, and by little and little gaining ground. Where there is no conflict, there is no spirit of Christ at all.”
–Richard Sibbes, Description of Christ