58 PHYSIOGRAPHY. 



Bismuthine Bismulh-Ochre. 



Cleavage parallel to the planes P and /, most perfec 

 parallel with the latter, and at right angles to /, affording 

 the measurement of 90 by the reflective goniometer 

 Fracture scarcely observable. Surface of the prisms deep- 

 ly streaked parallel to the axis. 



Lustre metallic. Color lead-grey, inclining a little tc 

 steel-grey. Streak unchanged. 



Rather sectile. Hardness = 2*0 . . . 2-5. Sp. gr. = 

 6-549. 



Compound varieties. Massive : composition granular, 

 the individuals being of various sizes; or columnar, indi- 

 viduals straight and aggregated in various directions. 



1. It is volatilized before the blow-pipe, and covers the charcoal with 

 a yellow areola. It is easily fusible, and emits continually small drops 

 in a state of incandescence. It is easily soluble in nitric acid, and the 

 solution yields a vrhite precipitate on^being further diluted. 



2. Analysis. 

 By SAGE. 



Bismuth 60-00 



Sulphur 40-00 



8. It occurs principally in veins, but is also found in beds, and is gen- 

 erally associated with Native Bismuth. 



4. It is a rare mineral. Its localities are, Altenberg, Schneeberg, 

 Joachimsthal, Rezbanya, Cornwall, Riddarhyttan in Sweden, Beresof in 

 Siberia, at Canock in Cumberland. 



It has been noticed at a single spot in the United States, in the cele- 

 brated Chrysoberyl locality of Haddam, (Con.) 



BISMUTH-OCHRE. Bismuthic Lusine-Ore. 



Massive: composition impalpable; earthy and pulver- 

 ulent. Fracture conchoidal to earthy. 



Color straw-yellow, or greyish yellow. 



