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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“Whatever we find lovely in a friend, or in a saint, ought to elevate our affections: we should conclude that if there is so much sweetness in a drop; there must be infinitely more in the fountain. If there is so much splendour in a ray, what must the sun be in its glory!”
–Henry Scougal, The Life of God in the Soul of Man