Vietnam or Thailand ? Vote for the TOP Country of the Week !
Of the white earth abounding on every side, which has given to the place the old name of Campi Leucogæi, and is the result of the metamorphosis of the trachytic tufa by the chemical action of the gases that rise up through the fumaroles, a very fine variety of porcelain known to collectors as Capo di Monti used to be made on the hill behind Naples, and it has been supposed that the china clays of Cornwall and other places have been produced from the felspars of the granites in a similar way.
These reagents will attack the bisilicates and felspars.
As a case in point, let us suppose that the water in one lode contained in solution carbonates of lime, and the alkalies and silica derived form a decomposition of felspars; and that the other, charged with hydro-sulphuric acid, brought with it sulphide of gold dissolved in sulphide of lime.
Word Of The Day