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) pearl dealers is another character that demonstrates greed and manipulation. When Kino tries to sell the pearl, the pearl dealer refuses to take the pearl for its actual price. Instead, he says it is worth less so that he could make more money. He heightens the difference between what Kino wants from the pearl and what it actually brings. These publications praised the novel as a "major artistic triumph" and emphasizes how Steinbeck understands "the universal significance of life." This novel did not have as great of a review later on. Though many still believe that Steinbeck's work was a