124 A SYSTEM OF 



the common manganefe, by giving to 

 the borax a deep red colour in the fire : 

 this fort acquires a reddilh brown co- 

 lour when it is calcined. 

 h. Red manganefe is laid to be found in 

 Piedmont. This I have never feen ; but 

 I have been told by an ingenious gentle- 

 man, that this variety is free from iron, 

 and gives to glafs rather a red than a vio- 

 let colour. 



SECT. CXVI. 



2. Mixed with a fmall quantity of iron, 

 Magnefia parum martialis. 



a. Black manganefe, with a metallic bright- 

 nefs. This is the moil common kind, 

 and is employed at the glafs-houfes, and 

 by the potters. 



It is found, 

 i. Solid, of a flaggy texture, Magnefia 



textura vitrea^ from Skidberget, in 



the pariili of Lekfand, in the province 



of Dalarne. 

 i. Steel grained, alfo from Skidberget. 



3. Radiated, Radiata, Itill from Skid- 

 berget, and Tiveden, in the province 

 of Oftergottland. 



4. Criftallifed. 



a. In form of coherent hemifpheres, 

 Hemifpheriis continuis^ from Skid- 

 berget in Lekfand. 



SECT. CXVII. 



3. Blended with a fmall quantity of iron 

 and tin, Magnefia parva cum portione mar- 



tis 



