Just like the shell of a clam, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite). in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur.
Rimula is a genus of fungi in the Helotiales order. The relationship of this taxon to other taxa within the order is unknown (incertae sedis), and it has not yet been placed with certainty into any family. ^ Lumbsch TH, Huhndorf SM. (December 2007). Outline of Ascomycota â 2007.
Quick Answer. The uvula is the small piece of pink tissue that hangs down from the roof of a person's mouth near the throat. A uvula is an extension of the soft palate, and its purpose isn't fully understood. A uvula may help prevent food from entering the sinus cavity while a person eats, and it may assist with speech.