Natural pearls
Contrary to popular belief, a natural pearls is notformed by a grain of sand. This story is an urban legend.
A natural pearl forms inside a bivalve mollusk when the shell has been invaded by a parasite or damaged. The most common reason a natural pearl will develop is due to parasitic invasion.
The parasite wil burrow through the periostracum layer (outer layer) of a mollusk shell and into the mother-of-pearl beneath. When the parasite penetrates the mother of pearl in comes in contact with the mollusk's mantle muscle. This muscle contains cells known as epithelial cells. These cells produce a substance called nacre which coats the inside of the shell (mother-of-pearl) and is the substance of which a pearl is composed.
The parasite becomes lodged in this mantle muscle and dies. The mollusk's definsive reaction is to grow a sac around the intruder. This sac is called the pearl sac. Once the sac encases the intruder the cells begin to deposit nacre- which is composed of aragonite and calcite (a calcium carbonate compound) platelets.
Cultured Pearls
Cultured (marine) pearls are grown by inserting a rounded bead of mother-of-pearl and a piece of mantle tissue containing epithelial cells from a donor mollusk into the gonad, or reproductive organ, of a host mollusk. The donor tissue grows into a pearl sac around the bead. As in natural pearl production, this sac then deposits nacre.
Maturity time of artificial oyester pearl
Sugar
It's a pearl and it helps them fly and makes them have magic powers
Her new dog is called Penelope. Before this dog, she had a little one, called Pearl.
I believe it means a gem that is made by animals. Such as a pearl.
A hog sometimes makes a snorting sound, and sometimes makes a squealing sound.
In Diamond and pearl it's level 85
what makes pearl harbor strong and vulnerable is the protection around it.
that makes no sense
pearL
calcium carbonate
Deidra on Hoof Isle makes seashell and pearl necklaces.
U2
yawn
it makes a phione
Pastoria
people can run out of air or drown
no
that makes no sense!