82 PHYSIOGRAPHY. 



Bornite Botryogene. 



1. Before the blow-pipe it melts very easily into a globule, that can 

 be entirely volatilized, during which the supporting charcoal is covered 

 with yellow oxide. If dissolved in the state of powder in nitric acid, a 

 precipitate of sulphur is formed. 



2. Analysis. 



By KL.APROTH. By WEHLE. 



Bismuth . . 95-01 . . 6M5 

 Sulphur . . 5-00 . . 1 2-33 



Tellurium 2974 



Silver 2-07 



3. It has been found at Deutsch-Pilsen in Hungary, accompanied by 

 several species of the genus Lime Haloide, Iron Pyrites, &c. 



4. Other varieties have been examined from different localities, which 

 require to be mentioned in this place. One from Hungary, for example, 

 has the following properties: 



It occurs in imbedded masses, having a general resemblance to 3 and 

 6 sided prisms. Cleavage perfect in the direction of the bases. Frac- 

 ture imperfectly conchoidal, uneven, scarcely perceptible. Lustre metal- 

 lic. Color intermediate between tin-white and steel-grey. Streak un- 

 changed or rather darker ; its place becomes shining in the mineral. 

 Opake. Very sectile. Thin laminae perfectly flexible. Hardness = 

 1-5. Sp. gr. =7-408. Before the blow-pipe it gives the reactions of 

 sulphur, tellurium and bismuth. It occurs accompanied by Native Gold 

 and Yellow Copper Pyrites, imbedded in Quartz, at Schemnitz. It con- 

 tains according to WEHLE, 



Bismuth . . . . . 59 84 

 Tellurium . . , . . 35-24 

 Sulphur 4-92 



5. Another variety, examined by BERZELITJS, which had been com- 

 municated to him by WEISS of Berlin, was found to contain only telluri- 

 um and bismuth. 



BOTRYOGENE. Paratomous Vitriol-Salt. 



Primary form. Oblique rhombic prism. M on M = 

 119 56'. 



Cleavage distinct in the direction of M and M'. 



Lustre vitreous. Color hyacinth-red. Streak yellow 

 and shining. Translucent, 



