The oysters are nucleated with a bead composed of mother-of-pearl and a small piece of mantle tissue. This bead becomes the nucleus of the pearl and is the reason akoya pearls are more often perfectly round.
Carbon definition, Chemistry. a widely distributed element that forms organic compounds in combination with hydrogen, oxygen, etc., and that occurs in a pure state as diamond and graphite, and in an impure state as charcoal.
Atomic carbon, also called monocarbon, is an inorganic chemical with the chemical formula C. It is a gas that only exists above 3,642 Â°C, below which it aggregates into graphite or other fullerenes.