153 PHYSIOGRAPHY. 



It is met with at Wunsiedel and Gopfersgrun in Bai- 

 reuth, in the Lizard district in Cornwall, in Saxony, in 

 Piedmont, in Sweden, in China, &c., most commonly in 

 veins, but also sometimes in imbedded irregular masses in 

 serpentine. 



STILPNOSIDERITE. .-, -en": 

 ORE. 



Stilpnosiderite. JAM. Syst. Vol. III. p. 549. Man. p. 331. 

 Stilpnosiderite. PHILL. p. 227. 



Small reniform and irregular dendritic shapes, mas- 

 sive. Composition impalpable. Fracture rather 

 perfectly conchoidal. 



JLustre resinous. Colour brownish-black, blackish- 

 brown. Streak yellowish-brown. Feebly trans- 

 lucent on the edges ... opake. 



Brittle. Hardness = 4-5. Sp. Gr. = 3-611, a re- 

 niform variety. 



Before the blowpipe it becomes black, but is infusible. 

 With borax it yields a dark olive-green glass, but is not 

 melted itself. According to VAUQUELIN and ULLMANN, 

 it consists of 



Oxide of Iron 80-25 80-50. 



SiKca >' 3-75 2-25. 



Water 15-00 16-00. 



Oxide of Manganese 0-00 a trace. 



From the observations of Mr FREIESLEBEN, relative to 

 the process of smelting this ore, it appears that it also con- 

 tains phosphoric acid. 



It occurs at Scheibenberg and Raschau in Saxony, in 

 the county of Henneberg, in Thuringia, in Nassau, in the 

 Hartz, &c. 



Stilpnosiderite is generally considered as a variety of 

 prismatic Iron-ore; it possesses a stronger lustre, from 

 which property the name has been dejcived. 



