78 PHYSIOGRAPHY. 



BUEITHAUPT. Scratches glass, and even quartz, 

 HAUY. Sp. Gr. = 2-300, SCHUMACHEE. 



Before the blowpipe it becomes white, and then melts 

 without effervescence into a colourless glass. It occurs 

 in the neighbourhood of Stavern in Norway, along with 

 prismatic Feld-spar. 



BISMUTHIC SILVER. 

 GLANCE ? 



Bismuthic Silver. JAM. Syst. Vol. III. p. 554. Man- 

 p. 318. Bismuthic Silver. PHILL. p. 294. 



Acicular and capillary crystals. Massive : compo- 

 sition impalpable. Fracture uneven. 



Lustre metallic. Colour light lead-grey, subject 

 to be tarnished. Opake. 



Sectile. Soft. 



It melts readily before the blowpipe, covers the charcoal 

 with an areola of the oxides of lead and bismuth, and final- 

 ly yields a silver button. It is dissolved in dilute nitric acid, 

 and, according to KLAPROTH, consists of 



Lead 33-00. 



Bismuth 27'00. 



Silver 15-00. 



Iron 4-30. 



Copper 0-90. 



Sulphur 1G-30. 



It has been found at Schapbach in Baden, along with seve- 

 ral minerals of the orders Pyrites and Glance, and also with 

 rhombohedral Quartz. It is used as an ore of silver. 



BLACK COBALT OCHRE. 



Black Cobalt-Ochre. JAM. Syst. Vol. II. p. 198. Man. 

 p. 111. Earthy Cobalt. PHILL. p. 28 J. 



