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.
As a defense mechanism, the particle is then coated with layers of nacre, a blend of minerals secreted by the oysters or other mollusks. These layers eventually become a thick enough coating to form a pearl. Mother-of-pearl is the name commonly given to shells coated in a deposit of nacre.