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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“If you would have light and heat, why then are you not more in the sunshine? If you would have more of that grace which flows from Christ, why are you not more with Christ for it?”
–Isaac Ambrose, Looking Unto Jesus