Pearl or parasite enters a bivalve mollusk and settles inside the shell. The mollusk, irritated by the intruder, forms a pearl sac of external mantle tissue cells and secretes the calcium carbonate and conchiolin to cover the irritant. This secretion process is repeated many times, thus producing a pearl. Natural pearls come in many shapes, with perfectly round ones being comparatively rare. Typically, the build-up of a natural pearl consists of a brown central zone formed by columnar calcium carbonate (usually calcite, sometimes columnar aragonite) and a yellowish to white outer zone consisting of nacre (tabular aragonite). In a pearl cross-section
Pearl Eytinge Pearl Eytinge Pearl Eytinge (1854–1914) was a New York-born actress, author, producer, playwright and activist who once said "“There is no vice on earth of which I have not partaken”". Her addiction to drink and drugs ended her stage career and it was said of her that: "“Pearl Eytinge the women slew Pearl Eytinge the artist”". In later years she lectured on the dangers of drug taking. When Pearl’s mother, Margaret Winship, met and later married Sol Eytinge, she had two children from previous relationships. Her son, James S Wyckoff, kept the name of his biological father whilst Pearl adopted