PHYSIOGRAPHY. 



Lustre metallic. Colour steel-grey, inclining to 



silver-white. 

 Brittle. Hardness = 5-0 ... 5-5. Sp. Gr. = 6451, 



a cleavable variety. 



It is partly volatilised before the blowpipe, during which 

 the supporting charcoal is covered with a white coating ; at 

 last it melts into a metallic globule, which communicates 

 a blue colour to glass of borax. It consists, according to 

 STKOMEYER and KLAPROTH, of 



Nickel 36-60 25-25. 



Antimony 43-80 4775. 



Arsenic 0-00 11-75. 



Sulphur 17-71 15-25. 



Iron and Manganese 1-89 0-00. 



It is met with in several mines in the principality of 

 Nassau, along with brachytypous Parachrose-baryte, pyra- 

 midal Copper-pyrites, hexahedral Lead-glance, &c. 



NITRATE OF SODA. 



SALT. 



Soude nitrate. HAUY. Traite', 2de Ed. T. II. p. 214. 

 Nitrate of Soda. PHILL. p. 191. 



Fundamental form. Rhombohedron. R == 106 



33'. Vol. I. Fig. 7. AP. 



a = V 2-05. 

 Simple form. R. 



Char, of Comb, and the combinations not observed. 

 Cleavage, R, perfect. Fracture conchoidal, almost 



imperceptible. Surface smooth. 

 Lustre vitreous. Colour white. Streak white. 



Transparent. 

 Rather sectile. Hardness = 1-5 ... 2-0. Sp. Gr. 



= 2 0964-, KLAPROTH. Taste cooling. 



