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 Pearl Saga The Pearl Saga The Pearl Saga is the name of the incomplete series of science fiction / fantasy novels by Eric Van Lustbader. The series centers on Kundala, a planet conquered by the V'ornn, a race of aristocratic, militaristic humanoids; themselves ruled by the Gyrgon, a cabal of mysterious androgynous technomages. The main character is Riane, a prophesied redeemer known as the Dar Sala-at, born at both ends of the cosmos. Kundala is a planet with Five moons and Nine seas. The five dragons created Kundala under the direction of the Goddess Miia. The daemons constructed and shaped Kundala. When