ORDER X. OCTAHEDRAL COPPER-PYRITES. 467 



as mixtures f the two sulphurets. In other respects it 

 differs little from the two preceding species. It is often 

 formed in slags. 



3. It occurs in beds along with other minerals contain- 

 ing iron, with dodecahedral Garnet-blende, &c. It forms 

 an accidental ingredient of several rocks, and crystallises 

 in their fissures. Its presence has also been ascertained in 

 several meteoric stones. 



4. The locality of some large and distinct crystals, pre- 

 erved in some of the Vienna collections, is not known. 

 Small crystals are found at Andreasberg in the Hartz. 

 The compound varieties occur more plentifully. There 

 are cleavable ones at Bodenmais in Bavaria, and various 

 others at Breitenbrunn and Geyer in Saxony, at Gieren and 

 Querbach in Silesia, in the Hartz, in several districts of 

 Stiria, particularly at Obedach, in Cornwall and other 

 countries. 



5. It does not seem as if anywhere the rhomhohedral 

 Iron-pyrites alone were employed to any use ; but as it 

 occurs often along with the hexahedral Iron-pyrites, it is 

 used for the same purposes. 



GENUS V. COPPER-PYRITES. 

 1. OCTAHEDRAL COPPER-PYRITES. 



Variegated Copper. JAM. Syst. Vol. III. p. 334. Man. 

 p. 278. Buntkupfererz. Purple Copper. PHILL. p. 

 299. Buntkupfererz. WERN. Hoffm. H. B. III. 2. S. 

 110. Bunter Kupferkies. HAUSM. I. S. 163. Bunt- 

 Kupfererz. LEONH. S. 256. Cuivre pyriteux he'pa- 

 tique. HAUY. Traite', T. III. p. 536. Tabl. comp. p. 

 86. Traitd, 2de Ed. T. III. p. 436. 



Fundamental form. Hexahedron. Vol. I. Fig. 1. 

 Simple forms. H (a) ; O (P). Char, of Comb. 



Tessular. Combination. H. O., Vol. I. Figs. 



3. and 4, Cornwall, 



