All are made largely of aragonite, the original shell material. The recent shells retain the organic material that give the shells their color and nacreous sheen. Nacre (mother of pearl) is an ...

Deep beneath the Earth’s surface lies a hidden world where nature has spent millions of years crafting spectacular crystal ...

Scientists have finally solved this mystery. a) Lens tips are flattened. b) A shell section reveals aragonite lenses, about 750 μm in diameter, with varying shapes and sizes depending on the shells. c ...