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.
rim. n. 1. a. The upper or outer edge of an object, especially when curved or circular. See Synonyms at border. b. The upper edge of a steep slope; a cliff or brink: the rim of a canyon.2. a. The circular outer part of a wheel, furthest from the axle.he had made friends with the spring down in the hollow-- that wonderful deep, clear icy-cold spring; it was set about with smooth red sandstones and rimmed in by great palm-like clumps of water fern; and beyond it was a log bridge over the brook. Anne Of Green Gables by Montgomery, Lucy Maud View in context.