PHYSIOGRAPHY. 



Atacamite. 



43 



not in excess) gives a white precipitate on the addition of water. With 

 hydriodic acid, it at first gives a blackish brown, and then a citron-yel- 

 low, precipitate. 



2. Analysis. 



By KERSTEJV, 



from Marienberg. 



Arsenic . ' . . . . 96785 

 Bismuth 3-001 



3. It occurs in small quantises only, at Palmbaum in Marienberg, ac- 

 companied by Native Arsenic, Red Silver, Fluor, Heavy Spar, Calca- 

 reous Spar, Copper Nickel, Native Silver, &c. 



4. It is not probable that the bismuth is a necessary ingredient in this 

 mineral, which might with more propriety be included under Native 

 Arsenic. 



AsBESTUS. 



Silky varieties of Hornblende, Pyroxene, Picrosmene and JYV- 

 molite : q. v. 



ASPARAGUS-STONE. (See Apatite.) 

 ASPHALTUM. (See Bitumen.) 

 ATACAMITE. Prismatoidal Habroneme- 



Malachite. PARTSCH. 



Primary form. Right rhombic prism. M on M / = 100 

 Secondary form. 



Fig. 48. 



M on M> 

 P on al 

 P on a2 

 P on c 

 P one 

 a2 on a'2 

 a2 on c 

 a2 on e 

 c on c' 

 c on d 

 c on e 

 e on e 



100' 



142 40 

 123 25 

 127 12 

 116 20 

 112 45 

 110 30 



143 25 

 107 10 

 159 00 

 137 40 

 127 07 



'PHILLIPS. 





