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Chalcedony is precipitated from silica-bearing solutions and forms cavity linings, veins, and replacement masses in a variety of rocks. It is found in petrified wood and some other fossils. Chert and flint, which are impure forms of chalcedony, may originate by the deposition of silica on the sea floor or by the replacement of rocks, notably limestone, by silica from percolating waters. Chalcedony's name is derived from Chalcedon or Calchedon, an ancient port of Bithynia, near present-day Istanbul, Turkey. The stone was much sought after in classical times as a gemstone and is still popular with jewellers and collectors as a gemstone and ornamental stone, often being artificially stained. Its popularity for carving and sculpture is due to its toughness and its occurrence in large, unbroken lumps. Different coloured varieties have individual names. CARNEL is red to reddish brown, SARD is light to dark brown; CHRYSOPRASE is apple green, and BLOODSTONE, or heliotrope, is green with red SPOTS.