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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“Let us then approach the throne of grace with confidence, so that we may receive mercy and find grace to help us in our time of need.”
– Hebrews 4:16