ORDER x. PRISMATIC ARSENICAL PYRITES. 449 



Char, of Comb. Prismatic. 



Combination. Pr. P-f oo. Fig. 1. Schladming, Stiria. 



Cleavage, P oo, perfect; less distinct j?r =86 1(X; 



traces of P + oo. Fracture uneven. Surface 



faintly streaked parallel to the common edges of 



combination, frequently smooth. 

 Lustre metallic. Colour between silver-white and 



steel-grey. Streak greyish-black. 

 Brittle. Hardness = 5-0 ... 5 5. Sp. Gr. = 7*228, 



the massive variety from Reichenstein. 



Compound Varieties. Massive: composition gra- 

 nular, individuals small, often nearly impalpable, 

 and strongly connected, fracture uneven ; compo- 

 sition columnar, rather thick and irregular, and di- 

 vergent. Faces of composition irregularly streaked. 



OBSERVATIONS. 



1. The axotomous Arsenical-pyrites contains arsenic and 

 iron, the proportions of which have not been ascertained. 



2. As far as our present information goes, the axotomous 

 Arsenical-pyrites has been found only in beds, either along 

 with brachytypous Parachrose-baryte and prismatic Iron- 

 ore, or imbedded in serpentine. With the first it occurs 

 in the valley of Loling near Hiittenberg in Carinthia, in 

 serpentine at Reichenstein in Silesia. It has likewise been 

 met with in beds in primitive mountains, with Nickel-py- 

 rites and Cobalt-pyrites at Schladming in Stiria, 



2. PRISMATIC ARSENICAL-PYRITES. 



Di-prismatic Arsenical Pyrites. JAM. Syst. VoL III. p. 272. 

 Prismatic Arsenic-Pyrites. Man. p. 268. Arsenical 

 Iron. Mispickel. PHILL. p. 215. Arsenikkies. WERN. 

 Hoffm. H. B. IV. 1. S. 211. Arsenikkies. HAUSM. 

 I. S. 153. Arsenikkies. LEONH. S. 332. Fer arse- 



