Ivory was a naturally occurring substance from Earth. Ivory grew from the faces of Elephants and similar creatures. This substance was valued for carving purposes, purported aphrodisiac qualities and, in the early 20th century, its novelty value.

Paul Harrington smoked an ivory pipe. (TOS novel: The Covenant of the Crown)

Hikaru Sulu practiced ivory carving using an artificial supplement. (TOS novel: The Fearful Summons)

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