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.

---

“Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.”
– Acts 4:12