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
The Mystery of the Pink Pearl The Mystery of the Pink Pearl The Mystery of the Pink Pearl ("Golapi Mukta Rahasya") is a Bengali detective story written by Satyajit Ray. Feluda is the protagonist of the story.It was first published in Sandesh (magazine), 1989. The story ranks 31st in Feluda series. In the title story, a rare pink pearl surfaces in a little Bengal village, and the owner turns to Feluda for protection against the machinations of the sleuth's old enemy, the devious Maganlal Meghraj. As the plot twists and turns, Feluda ends up in the sinister galis of Banaras, where he must outwit Maganlal once