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 Thompson Thompson is also featured on the album "Callus" by Gonjasufi, released in August 2016. Thompson is noted for being reclusive and private about his personal life, and is primarily now dedicated to painting. Pearl Thompson Pearl Thompson (born Paul Stephen Thompson on 8 November 1957 in Surrey), previously known as Porl Thompson, is an English musician best known for being a member of The Cure. Though friends had long used the name "Pearl", Thompson legally changed his first name to the female name "Pearl" in 2015. Thompson was part of the original lineup of The Cure (then known as Easy