EXAMINATION OF THE OCHROITES. 209 



leaving merely a pale red precipitate of fuccinate of Iron, 

 This being colleded, wadied, dried, and flrongly ignited, 

 yielded nine grains of oxide of iron. 



c. The fluid thus freed from iron, and now colourlefs, was 

 decompofed by carbonate of ammonia. The precipitate 

 obtained was white, and weighed 168 grains, on being 

 deprived of water and carbonic acid by heat, its white colour 

 changed to cinnamon-brown. It weighed 109 grains. 



d. All the water employed for wafliing the different pre- 

 cipitates were mingled, evaporated to drynefs, and the am- 

 moniacal fait volatilized ; a minute quantity of a muriate was 

 obtained, the bafis of which could not be determined. 



From what follows it will become evident, that the cinnamon- Peculiar earthii 

 brown precipitate (c.) which forms the principal part of the 

 foffil is a peculiar earth, diftind from all the others hitherto 

 known. The charadleriftic property which it poflTefTes of ac- 

 quiring a light-brown colour after being heated, has induced 

 me tocall it ochroit eartli*, which may alfo ferve for the mineral 

 itfelf. 



According to this analyfis, 100 parts of the ochroite of 

 Ridderhytta contain, 



Ochroit earth - - - 54,50 



Silex 34 



Oxide of iron - . - _ 4, 



Water, &c. (A.b.) - - - 5 



Lofs 2 



100. 

 CharaBeriftic Properties of Ochroit Earth. 

 1. Ochroit earth is capable of combining with carbonic Ochroit eaitb, 

 acid during its precipitation from acids by carbonated alcalies, ^.^ u^'^^'^J"^^ 

 and ftrongly confolidating a portion of water. acid. 



100 grains of the earth precipitated by carbonate of am- 

 monia, and ftrongly dried, loft on being neutralized by nitric 

 acid, 23 grains : 100 grains of the fame earth loft after being 

 flrongly ignited, 35 grains, 100 parts of carbonate ochroite 

 therefore confifts of 



Ochroit earth . ^ . ^ 65 

 Carbonic acid - - - - 23 

 Water 12 



100. 

 * From the Greek word o^xfoj, (Havefcens,) browni/h yellow. 

 V©!,. VIIL— July, 1804, P 2. Ochroit 



