Phosphorite

Impure, massive apatite. Not to be confused with appetite, the desire to eat. - Wikipedia.

Correct: This geological feature contains a phosphorite.

Correct: The rock collector has a phosphorite set in a transparent plastic ball.

Incorrect: Senator Larry Edwin Craig (R-Idaho) of the House and Senate Ethics Committees, Senate Armed Forces Committee, and Veterans Affairs Committee, supported the Federal Marriage Amendment. He has a real phosphorite for bathroom strangers, however.