A great irony of pearl history is that the least expensive ... To reduce irritation, the mollusk coats the intruder with the same secretion it uses for shell-building, nacre.

The Alabama pearlshell mussel, a small, endangered mollusk found in a just a few creeks in south Alabama, which can outlive ...

And not every pearl comes out the same. The size of the pearl largely depends on the size of the mollusk. For example, akoya pearls can only grow about 9 or 10 millimeters in diameter, but South ...

Like oysters and mussels, clams are bivalves, a kind of mollusk that's encased in a shell ... and, sometimes, a pearl. And you thought oysters were fancy. Following is the transcript of the ...