PHYSIOGRAPHY. 



Skorodite. 



181 



SILICO-CALCAREOUS OXIDE OF TITANIUM. (SeeSphene.) 

 SILLIMANITE. (See Bucholzite.) 



SlLVER-BlSMUTH. 



In acicular and capillary crystals. Massive ; composition im- 

 palpable. Fracture uneven. 



Lustre metallic. Color, light lead-grey. 



1. Before the blow- pipe it melts with ease, and covers the charcoal 

 with oxide of lead and bismuth, leaving a globule of silver behind. 



2. Analysis. 

 By KLAPROTH. 



Lead 3300 



Bismuth 27-00 



Silver 15-00 



Iron 4-30 



Copper 090 



Sulphur 16-30 



3. It occurs at Schlapbach in Baden. 



SILVER-BLACK. 



Massive ; composition impalpable, in crusts, pulverulent. 

 Color bluish-black, sometimes blackish lead-grey. 



1. It melts easily before the blow-pipe into a slaggy mass, leaving a 

 metallic button on farther heat. 



2. It is found in the silver mines of Saxony, Hungary, in Siberia, and 

 in South America. 



SKORODITE. Prismatic Malachite-Haloide. 

 PARTSCH. 



Primary .form. Right rhombic prism. M on M=.120', 

 Secondary forms. 



Fig. 392. Fig. 393. 



Cornwall. 

 VOL. II. 



16 



Saxony-. 



