286 Elements of Mineralogy. 



1768. The Earth of Beuthnitz in SHe/ia* 

 mentioned in the Memoirs of Berlin for the 

 year 1 757, feems to belong to this fpecies, it 

 contains about -^ of its weight of iron. 



SPECIES XXVI. 



Green Earth of Verona and Normandy. 

 Terre Verte. 



40. This is ufed as a pigment, and contains 

 iron in fome unknown ftate, mixed with 

 clay, and fometimes with chalk and pyrites; 

 allum and feienite arealfo accidentally found 

 with it. It is difficultly foluble in acids, is 

 not magnetic before calcination, and becomes 

 of a coffee colour when heated. It is faid to 

 afford about 40 per cent of iron. If iron be 

 precipitated from vinegar, by the arfenical 

 acid, the precipitate will be green, 36 Mem. 

 Stock, and it will preferve its colour though 

 expofed to the air. Iron precipitated from 

 the marine acid by lime water, is frequently 

 green, and green fluors are known to derive 

 their colour from this metal. The molyb- 

 denous acid gives alfo a green colour to iron, 

 but this fades, 



Of 



