Manganefe. 347 



SPECIES II. 



Mineralized by the Aerial Acid. 

 Native Calces of Manganefe* 



5. The aerial acid is the only mineralizer of 

 mahganefe in a dry ftate, yet known -, and 

 according to the different degrees of phlogifti- 

 cation of the manganefe, it forms with it calces 

 of different colours and different properties, to 

 underftand which it is iieceffary to remark, 

 that when manganefe is as much phlogifti- 

 cated as it can be, without being in a reguline 

 ftate, it forms a white calx, which contains 

 a large portion of fixed air (about 40 per 

 cent.) which enables it to retain phlogifton, 

 as the compound of acid and calx, at- 

 tracts phlogiflon more ftrongly than either 

 does when flngle ; in proportion to its de- 

 phlogiftication, and by union with other fub- 

 Itances, its colour is either blue 9 greenly ello r w^ 

 red) brown or black \ blue^ is that which it 

 acquires from the proportion of phlogiflon, 

 which it is enabled to retain by reafon 

 of its union with fixed alkalis ; green arifes 

 from a mixture of the blue with the yellow 

 calx of iron - y yellow always arifes from the 

 prevalence of the calx of iron ; red> from a 

 flight phlogiftication of the calx of manga- 

 nefe ; blacky from its thorough dephlogifti- 



cation. 



