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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“For I know the plans I have for you, declares the Lord, plans to prosper you and not to harm you, plans to give you hope and a future.”
– Jeremiah 29:11