Zircon. A material occurring in tetragonal crystals, usually of a brown or gray color. It consists of silicon, iron and zirconium, and is harder than the garnet. The transparent varieties are used as gems. The red variety is called Hyacinth; a colorless, pale yellow, or smoky-brown variety from Ceylon is called jargon.

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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