APPENDIX. 321 



19 p. c. of its weight when exposed to a slight red heat. It occurs in 

 very small quantity at Bastnaes in Sweden. 



CARBONATE OF LIME AND SODA. 



Massive. Cleavage like Calcareous Spar. Transparent. Possesses 

 double refraction. Before the blow-pipe it decrepitates a little, becomes 

 brown, and is eventually reduced to lime. It is entirely soluble with ef- 

 fervescence in nitric acid. It contains 



Carbonate of lime 70-00 



Carbonate of soda 1400 



Water ...... 9-7 



Peroxide of iron TO 



Its locality is not known. 



CELESTINE. Analysis. 



By DAURIER. 



Sulphate of strontian 68-900 



Sulphate of lime 0-105 



Carbonate of lime 27-785 



Oxide of iron 0-150 



Oxide of manganese 0-050 



Water 3'000 



CHONIKRITE. 



Massive : composition impalpable. Fracture uneven, and imperfect- 

 ly conchoidal. Lustre glimmering, or dull. Color white, with shades 

 of yellow and grey. Translucent, often only on the edges. Scratches 

 Common Salt; is scratched by Fluor. 



1. It melts before the blow-pipe easily, into a greyish glass. With 

 horax, it slowly melts into a glass colored by iron. It is easily deconv- 

 posed by concentrated muriatic acid. 



2. Analysis. 

 By KOBELL. 



Silica 3569 



Alumina 17-12 



Magnesia 2250 



Lime 12-00 



Protoxide of iron 1-46 



Water 9-00 



3, It occurs in rounded masses at Elba. 



