148 Washington — Suggestion for Mineral Nomenclature. 



all known minerals, so that only a few selected cases are given 

 which will illustrate the points brought out above. It is pur- 

 posed to publish elsewhere a fairly complete list, already 

 prepared, which will serve as a basis for the suggested nomen- 

 clature. 



Sphalerite Group. 

 SphalerideS) R"(S 5 Se,Te), isometric, tetrahedral. 



Sphalerite, ZnS Zinc sulsphaleride 



Metacinnabarite, HgS Mercury sulsphaleride 



Alabandite, MnS Manganese sulsphaleride 



Tiemannite, HgSe Mercury selsphaleride 



Onofrite Hg(S,Se) Mercury selsulsphaleride 



Coloradoite, HgTe Mercuiy telsphaleride 



Pyrite Group. 

 Pt/rides, R(S,As,Sb) 2 , isometric, pyritohedral. 



Pyrite, FeS 3 Iron sulpyride 



Hauerite, MnS 2 Manganese sulpyride 



Laurite, RuS 2 Ruthenium sulpyride 



Smaltite, CoAs 2 Cobalt arsenpyride 



Chloanthite, NiAs 2 Nickel arsenpyride 



Sperrylite, PtAs 2 Platinum arsenpyride 



Cobaltite, Co(8,As) 2 Cobalt sularsenpyride 



Gersdorffite, Ni(S,As) 2 Nickel sularsenpyride 



Marcasite Group. 

 Marcasides, R(S,As) 2 , orthorhombic. 



Marcasite, FeS 2 Iron sulmarcaside 



Lollingite, FeAs 2 Iron arsenmarcaside 



Safflorite, CaAs 2 Cobalt arsenmarcaside 



Rammelsbergite, NiAs 2 Nickel arsenmarcaside 



Hematite Group. 



Ileniatides, R 2 3 , trigonal. 



Corundum, A1 2 3 Aluminum hematide 



Hematite, Fe 2 3 Iron hematide 



Ilmenite, (Fe,Ti) 2 3 Titanferri hematide 



Geikielite, (Mg,Ti) 2 3 Titanmagnesi hematide 



Pyrophanite, (Mn,Ti) 2 3 Titanmangani hematide 



If the members of this group are considered to be aluminates, 

 ferrates, etc., the appropriate names would be : Aluminum alhem- 

 atate, iron ferhematate, iron titanhematate, magnesium titan- 

 hematate, and manganese titanhematate. 



