Manuscript, description of a Swedish stone, which affords sulphur, vitriol, allum and minium by G Talbot Description of a stone imparted to Talbot in his capacity as Extrordinary Envoy in Demark and the process by which various useful minerals are extracted from it. 'There is a stone in Sweden of a yellow colour, intermixed with streaks of white (as if composed of gold and silver)'. There are different processes for extracting each compund from the stone over a period of years. Melting for sulphur, sun drying to the point of combustion and infusing with water for blue vitriol [copper sulfate], reuse of the infused water mixed with urine and ash to make alum, and baking the remaining sediment in home ovens to leave red minium powder [lead tetroxide] for painting and plastering. Includes a small figure of an iron pot used in the process of sulphur extraction, appears in the margin of page 1 (see CLP/9i/18/2). Read to the Royal Society on 23 May 1666 Subject: Mineralogy / Chemistry / Industry [1666]