De Re Metallica, Translated from the First Latin Edition of 1556 by Georg Agricola

Book II., "earths"--clay, Lemnian earth, chalk, ochre, etc.; Book III.,

"solidified juices"--salt, _nitrum_ (soda and potash), saltpetre, alum, vitriol, chrysocolla, _caeruleum_ (part azurite), orpiment, realgar, and sulphur; Book IV., camphor, bitumen, coal, bituminous shales, amber;