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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“Christ was like us in our nature, but not in our blemishes; he had our flesh, but without the least stain of imperfection; he had the likeness of sinful flesh, but there was not any sin in him.”
–Stephen Charnock, Discourses on Christ Crucified