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 (novel) the end, the finding of the great prize causes him to lose another, his son. Perseverance -The theme of perseverance is demonstrated by many characters, but mainly Kino. Before he found the pearl, he was a noble and a very determined person who sought fortune for his family. After he finds it, he is hoping to find it in a diffrent way. Because Kino believes that this would save his family, he persists “though many obstacles”that accompany the pearl. He perseveres to keep the pearl but, in the end, it was not worth keeping. Kino is the main character that