496 



wherry: sulfide minerals 



I The variety of pyrite showing this sym- 

 { metry probably contains arsenic or some 



other element isomorphously replacing 



part of its sulfur. 



Includes "corynite" (Dana No. 91), an im- 

 pure variety. 



/ This and the preceding form limited iso- 

 I morphous mixtures. 



(Tetartohedral 



pyrite) Fe(S,X)2 



Cobaltite CoSAs 



Gersdorffite NiSAs 



Ullmannite NiSSb 



WiUyamite CoSSb 



Kallilite NiSBi 



MARCASITE GROUP. ORTHO- 

 RHOMBIC. 



Krennerite xAgTe2.3'AuTe2 An isomorphous series. 



Calaverite AuTe2 



Nagyagite (Pb,Au)- 



(S,Te,Sb)2. Composition uncertain. 



Marcasite FeS2 



Arsenopyrite FeSAs "Mispickel." 



Loellingite FeAs2 



The ending ite is added for uniformity, in- 

 cludes "danaite" and "alloclasite" (Dana 

 No. 102), an impure form, Murdoch, op. 

 cit., p. 37. 



Includes "badenite," apparently an impure 

 form. 



Wolfachite NiSAs Only known in impure form. 



Rammelsbergite NiAs2 



SYLVANITE GROUP. MONOCLINIC. 



Sylvanite AgTe2.AuTe2 



Melonite NiTe2 



NON-CRYSTALLIZED GROUP New. 



f In part amorphous and in part metacol- 

 Melnikovite FeS2.*H20 | j^j^^j^ cryptocrystalline. 



I :X DIVISION New; ratio X ranging from 2+ to 3. 



SKUTTERUDITE GROUP. ISO- 

 METRIC PYRITOHEDRAL NeW. 



Skutterudite C0AS2-3 Includes much so-called "smaltite." 



(High-arsenic / Analogous to the preceding; not yet assigned 



cloanthite) NiAs2-s \ a separate name. 



Glaucodotite xCoSAs.yFeSAs 1 



I 



Saflaorite CoAs. 



Includes "goldschmidtite," a variety of un- 

 usual habit. 



