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 V'ornn. The one thing they fear. They inflicted a punishing defeat upon the V'ornn fleet at Hellespennn 250 years previous, in revenge for the V'ornn invasion of their world 300 years prior to that. Their weapons utilize a Goron particle beam. The novels revolve around these items and the quest to find them. Van Lustbader has stated that due to the popularity of the Bourne Series, the Pearl Saga was put on hold. He says the series is expected to run to 6 or 7 novels. The Pearl Saga The Pearl Saga is the name of the incomplete series of