Why did the sad geologist skip his lunch break?

Because he lost his apatite.

What did the rock-eating scientist say when he wasn’t hungry?

I’ve lost my apatite.

Why wasn't the geologist hungry?

He lost his apatite.

I know that joke has its faults, so I'll just accept my pumicement and go back to looking at cleavage.

What do you call the mineral found in teeth and tooth enamel?

Apatite.

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