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We love puns, and this one is a classic geology pun.
On the front, "Why wasn't the geologist hungry? She lost her Apatite."
On the back, "Apatite is often mistaken for other minerals. This tendency is reflected in the mineral's name, which is derived from the Greek word apatein, meaning to deceive. Radioactive decay in apatite is often used to date the ages of rocks containing the mineral."
