492 



wherry: sulfide minerals 



Siderazotite ^e^No 



"Silvestrite;" ending ite added for uniform- 

 ity; included by Dana with native ele- 

 ments, but evidently a compound. 



2 : 1 DIVISION New; part of Dana's "monosulfides, " 



ARGENTiTE GROUP. ISOMETRIC. . New; part of Dana's "galena group." 



The stable form at high temperatures, prob- 

 ably represented in massive occurrences 

 of "chalcocite;" not yet assigned a sep- 

 arate name. 



(Isometric chal- 

 cocite) CujS 



1 



J "Jalpaite;" distinctness affirmed by Mur- 

 \ doch, op. cit., p. 140. 



Compare Quercigh, Riv. min. crist. Ital., 

 44: 26. 1915. 



Eucairite Cu^Se. Ag-iSe 



Argentite AgaS 



Cupriferous var. (Ag,Cu)2S 



Aguilarite Ag2(S,Se) 



Naumannite AgaSe 



Hessite AgzTe 



CHALCOCITE GROUP. ORTHORHOMBIC. 



Chalcocite CU2S 



Stromeyerite CU2S. AgaS 



Acanthite Ag2S 



NON-CRYSTALUZED GROUP New. 



Berzelianite CuaSe 



Crookesite 7Cu2Se.Tl2Se 



f Occurrence in nature affirmed by Cornu. 

 (Amorphous ar- ^ ^ ^;,^^ j^^^ Kolloide 4: 187. 1909; 



g^^t'^^) ^^^^ [ not in Dana; not yet named. 



Petzite aAgaTe.AuoTe 



4:3 TO 8:5 DIVISION New. 



BORNITE GROUP. ISOMETRIC New. 



(Isometric high- 

 sulfur chalco- 

 cite) CU2S1-1.2 



Compare Posnjak, Allen, and Merwin, Econ. 

 Geol. 10: 492. 1915; not yet named. 



Bomite Cu5FeS4 



The old formula CusFeSs, has been dis- 

 credited. 



MAUCHERITE GROUP. TETRAG- 

 ONAL New. 



{ "Placodine," artificial; "temiskamite;" the 



Maucherite NisAs* { formula has been suggested to be Ni4As3 



[ by Palmer, Econ. Geol. 9: 664. 1914. 



HIGH-SULFUR CHALCOCITE GROUP. 



ORTHORHOMBIC New. 



(High-sulfur chal- Compare Posnjak et al, loc. cit.; not yet 



cocite) CU2S1-1.2 named. 



