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.
Learn Spanish in Spain. Las Medulas. Las Medulas. Las MÃ©dulas is an area located in the region of Bierzo, its landscape is characterized by its chestnut and oak forests and red rock formations. Las MÃ©dulas is an area located near a village of the same name, in the Bierzo region of the Province of Leon in Spain.