Grapefruit is oblate in shape, ranges in diameter from 3 to 5 inches and can weigh up to 150 g. Characteristically, it has thick, tough skin than that in the oranges. Inside, the fruit is segmented into arils as in other citrus fruits.
Nacre (/ËneÉªkÉr/ NAY-kÉr also /ËnÃ¦krÉ/ NAK-rÉ),[1] also known as mother of pearl, is an organic-inorganic composite material produced by some molluscs as an inner shell layer; it also makes up the outer coating of pearls. It is strong, resilient, and iridescent.
Nacre is also the substance that coats the inner surface of bivalve shells. In gem pearl-producing bivalves this nacreous shell lining also has a pearly luster and is called mother-of-pearl. Nacre is secreted in a succession of concentric, very thin, translucent layers around the irritant.