BOLOGNESE. See GRIMALDI.
BOLOGNIAN or BONONIAN STONE, a phosphoric
substance first discovered near Bologna in Italy, whence
it received its name. It has been supposed to contain
some metallic matter, on account of its great specific
gravity; but it is now found to be only a compound
of ponderous earth and sulphuric acid. See BARY-
TES, MINERALOGY Index.