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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“This is how we know what love is: Jesus Christ laid down his life for us. And we ought to lay down our lives for our brothers.”
– 1 John 3:16