Marble. Is a valuable stone, formed by the union of earth of lime, with carbonic acid, or in the modern Language of mineralogy, is carbonated lime, found in great masses and dug out of pits or quarries. Being of a hard, compact constitution, and so tine as readily to take a beautiful polish, it is much used in ornaments of buildings, as columns, statues, altars, tombs, chimney-pieces, babies, and the like, Hauy has described nearly 100 different varieties of carbonated lime, but there is still an indefinite number of different kinds of marble, usually denominated either from their colour, their age, their country, their grain, their degree of hardness, their weight, or their defects; some are of one simple colour, as white, or black ; others streaked or variegated with stains, clouds, waves, veins, etc. but all opaque except the white, which, when cut into thin slices, becomes transparent. English white marble is veined with red. Derbyshire marble is variously clouded, and diversified with brown, red, and yellow. That of Devonshire is either black with white veins, or red shaded with gray and orange. Marble of Auvergne, in France, is of a pale red, mingled with violet, green, and yellow. Various other kinds are denominated by the places from which they are brought, as Dinan, near Liege - Namur, Lanuuedoc, Sa-voy, Sicily, Spain, etc. Artificial Marble is only marble pulverized, and mixed in a certain portion with plaster; the whole well sifted, worked up with water, and used like common plaster. With this stucco are made statues, busts, basso-relievos, and other ornaments of architecture. Marble is polished by being first rubbed with freestone, afterwards with pumice-stone, and last with emery, putty, or calcined tin.