494 



wherry: sulfide minerals 



GUADALCAZARITE GROUP. TRI- 

 GONAL-HEMIMORPHIC. 



Guadalcazarite HgS 



CINNABARITE GROUP. TRIGONAL- 

 TRAPEZOHEDRAL. 



Cinnabarite HgS 



HAUCHECORNITE GROUP. TETRA 

 GONAL 



Hauchecomite 4NiS.NiBi 



CHALCOPYRITE GROUP. TETRA- 

 GONAL-SPHENOIDAL 



I Has been confused with metacinnabarite, 

 1 but differs in crystallization and important 

 I physical properties; compare the writer, 

 [ Amer. Min. 5: 35. 1920. 



The ending ite is added for uniformity. 



New. 



Composition uncertain. 



Chalcopyrite CuS.FeS 



Stannite 2CuS.SnS.FeS 



Zinciferous var. . 2CuS.SnS.- 

 (Fe,Zn)S. 



CHALMERSITE GROUP. ORTHO- 

 RHOMBIC 



Chalmersite CuS.2FeS 



Empressite AgTe 



Muthmannite xAgTe.yAuTe 



Teallite SnS.PbS 



(Orthorhombic 



pyrrhotite) . . . FeS 



NON-CRYSTALLIZED GROUP 



(Amorphous co- 



vellite) CuS 



Voltzite Zn0.4ZnS 



(Amorphous 



sphalerite).. . .ZnS 



Xanthochroite CdS.xHaO 



(Amorphous cin- 

 nabarite) HgS 



Onofrite sHgS.HgSe 



Coloradoite HgTe 



Lehrbachite jcHgSe.j'PbSe 



Marked off though not named by Dana. 

 f Includes "barnhardtite," "barracanite," 

 I "cubanite" (Dana No. 81) and "cupro- 

 pyrite," impure forms, Murdoch, op. cit.; 

 formerly regarded as a cuprous-ferric sul- 

 fide, but X-ray study shows the Cu and 

 Fe to have analogous positions. 



Hydrotroilite FeS.xHjO 



Jaipurite CoS 



New. 



'Krennerite" in part. 



Artificial; "a-pyrrhotite." 

 New. 



Occiurrence in nature affirmed by Cornu, 

 loc. cit.; not in Dana; not yet named. 

 Included here for simplicity. 



Mentioned but not named by Dana. 

 Rogers, Journ. Geol. 25: 524. 1917. 



Occurrence in nature affirmed by Cornu, 

 loc. cit.; not in Dana; not yet named. 



An isomorphous series. 



I Sidorenko, Mem. soc. nat. Nouv. Russie 

 \ 24: 97, 1901; Neues Jahrb. Min. Geol. 



[ 1902, II, ref . 397 ; not in Dana. 



