ORDER XI. DI-PRISMATIC COPPER-GLANCE. 5 



Compound Varieties. Massive: composition 

 granular, individuals strongly connected. 



OBSERVATIONS. 



1. The prismatoidal Copper -glance has been hitherto 

 found only in the beds of brachytypous Parachrose-baryte 

 at St Gertraud near Wolfsberg in the valley of Lavant in 

 Carinthia. It is very nearly allied to the following species. 

 It will depend upon future accurate examinations, particu- 

 larly of its regular forms, whether or not the varieties of 

 the two species are identical. * 



2. Before the blowpipe the present species gives very 

 nearly the same results as the following one. It appears 

 to contain sulphur, antimony, lead, and copper, and it 

 yields also a little silver, for the extraction of which it is 

 collected by the miners, without, however, properly speak- 

 ing, being an object of mining. 



3. DI-PRISMATIC COPPER-GLANCE. 



Axifrangible Antimony-Glance, or Bournonite. JAM. 

 Syst. Vol. III. p. 399. Bournonite. Triple Sulphuret. 

 PHILL. p. 336. Schwarzspiesglaserz. WERX. Hoffm. 

 H. B. IV. 1. S. 111. Bleifahlerz. Spiessglanzbleierz. 

 HAUSM. I. S. 170. 173. Bournonit. LEONH. S. 155. 

 Plomb sulfure antimonifere. HAUY. Tabl. comp. p. 80. 

 Antimoine sulfure plombo-cuprifere. Traite de Crist. 

 T. II. p. 483. 



Fundamental form. Scalene four-sided pyramid. 

 P = 136 7', 66 13', 133 3'. Vol. I. Fig. 9. AP. 



a : b : C = l : V M37 : V 0-226. 



Simple forms. P oo (Ar) ; P 1 ; P (P) ; 

 (Pr 1)3 (y) = 114 14', 115 2', 109 16'; 



* The present species was determined by Professor MOHS, be- 

 fore he was acquainted with any of the varieties of the following 

 one. Though it is likely that they do not present any specific 

 difference, it would be too precipitate to unite them, without 

 being capable of affording a demonstration of their identity. H. 



