134 



Mr. D. Forbes' s Researches on the 



Fluor-spar, CaFl. 



Galena, PbS. 



Garnet, 3FeO, Si0 3 +Al 2 O 3 , SiO 3 . 



Gibbsite, Al 2 3 +3HO. 



Glauberite, (NaO CaO) SO 3 . 



Glauber-salt, NaO SO 3 4- 10 HO. 



Glaukodote, (CoFe) (S As) 2 . 



Gold, Au. 



Gothite, Fe 2 3 +HO. 



Graphite, C. 



Grossular, 3CaO, Si0 3 +Al 2 O 3 , SiO 3 . 



Guayacanite, 3Cu 2 , S+As S 5 . 



Gypsum, CaO SO 3 +2 HO. 



Ha3matite, Fe 2 O 3 . 



Hayesine, CaO, 4 BO 3 . 



Homocline, 2 Cu 2 S+FeS 2 . 



Hornblende, 3RO, 2Si0 3 +RO, SiO 3 . 



Iodyrite, AgL 



Iron, meteoric. 



Iron -pyrites, FeS 2 . 



Iron, magnetic, Fe 7 S 8 . 



Iron glance, Fe 2 O 3 . 



Iron magnetic oxide, Fe 3 0*. 



Iron protosulphide, FeS. 



Kerargyrite, AgCl. 



Kermesite,Sb0 3 +2SbS 3 . 



Labradorite, RO Si0 3 +Al 2 O 3 SiO 3 . 



Lapis lazuli *. 



Laumonite, 3CaO, 2Si0 3 +3Al 2 O 3 , SiO 3 



+ 12 HO. 

 Lead oxychloriodide, 2Pb (CI 2 1) -f- 3PbO. 

 Leucopyrite, FeAs 2 . 

 Libethenite, 5Cu0,P0 5 +H0. 

 Limonite, Fe 2 3 +3HO. 

 Linarite, PbO SO 3 + CuO HO. 

 Magnetite, Fe 3 4 . 

 Malachite, CuO CO 2 -f HO. 

 Marmatite, (ZnFe)S. 

 Marcasite, Fe S 2 . 



Melanite, 3 CaO, Si0 3 +Fe 2 3 ,Si0 3 . 

 Mercury, Hg. 

 Miargyrite,AgS + Sb 2 S 3 . 

 Mimetene, 9 PbO (AsP) 5 +PbCl. 

 Minium, Pb 3 4 . 

 Mispickel, FeAs 2 + FeS 2 . 

 Molybdenite, MoS. 

 Muscovite, (3RO, R 2 O 3 ) SiO 3 . 



Natron, NaO CO 2 + 10 HO. 

 Nitratine, NaO, NO 3 . 

 Nitre, KO, NO 5 . 

 Olivine, 3 RO, SiO 3 . 

 Olivinite, 4CuO, As0 5 +HO. 

 Oligoclase, RO, Si0 3 +Al 2 O 3 , 2 SiO 3 . 

 Orthoclase, KO, SiO 3 + Al 2 O 2 , 3 SiO 3 . 

 Pearlspar, CaO CO 2 -f MgO CO 2 . 

 Pelokonite, ROMn0 2 + HO. 

 Pharmacolite, 2CaO, As0 5 + 6HO. 

 Phosphochalcite, 5CuO,P0 5 +3HO. 

 Phosphate of lime and copper. 

 Pickeringite, MgO, SO 3 + Al 2 O 3 , 3 SO 3 



4-24HO. 

 Polybasite, 9(AgCu 2 ) S-f-(SbAs) 2 S 3 . 

 Prehnite, 2CaO Si0 3 4-Al 2 3 SiO 3 + HO. 

 Proustite, 3AgS+AsS 3 . 

 Psilomelane, RO,Mn0 2 -f HO. 

 Pyrargyrite, 3AgS + Sb S 3 . 

 Pyrrhotine, Fe 7 S 8 . 

 Quartz, SiO 3 . 

 Rammelsbergite, NiAs 2 . 

 Resin (fossil). 

 Realgar, AsS. 

 Rutile, TiO 2 . 

 Sal-ammoniac, NH 4 CI. 

 Salt, NaCl. 

 Sassolin, BO 3 . 



Scapolite, 3 RO, 2Si0 3 +2A1 2 O 3 , SiO 3 . 

 Scheelite, cupreous, (CaO CuO) WO 3 . 

 Schreibersite, (Ni 2 Fe 4 )P. 

 Scolezite, CaO Si0 3 +Al 2 3 Si0 3 +3HO. 

 Silver, Ag. 

 Silver glance, AgS. 

 Smaltine, (Co Fe Ni) As 2 . 

 Sphserosiderite, FeO CO 2 , argillaceous. 

 Stephanite, 6 AgS +Sb 2 S 3 . 

 Stibnite, Sb 2 S 3 . 



Stilbite, CaO, Si0 3 +Al 2 O 3 , 3Si0 3 . 

 Stromeyerite (Cu 2 Ag) S. 

 Stypticite, 2Fe 2 3 ,2S0 3 . 

 Sulphur, S. 



Sulphide of zinc and lead, 3 ZnS +2PbS. 

 Tagilite, 4 CuO, P0 5 +3HO. 

 Talc, 6 MgO, 5 SiO 3 + 2 HO. 

 Taltalite,6CuO,Si0 3 + 2(Al 2 3 Fe 2 3 )Si0 3 

 Tannenite, Cu 2 S + Bi 2 S 3 . 



* I have not visited the locality of this mineral near Ovalle, but I have 

 been informed that it is found at the point of contact of a limestone rock 

 with a diorite or granite. 



