398 



Decomposition of Iron Pyrites. 



Locality. 



Kind of Pyrites. 



Monroe, Orange Co.. 



N. Y. 

 Warwick, Orange Co. , 



N. Y. 



Anthony's Nose, N.Y. 



Kent, Putnam Co., 



N. Y. 

 Phillipstown, N. Y. 



Jefferson Co., N. Y. 



Orange and Milford. 

 Ct. 



Trumbull and Mon- 

 roe, Ct. 



Stafford, CL 



Roxbury, Ct. 



Canaan, Ct. 



Sheffield, Mass. 



Great Barrington, 

 Mass. 



Stockbridge, Mass. 

 Lee, Mass. 



Cummington, Mass., 

 and, in general, 

 Western New Eng 

 land. 



Charlemont, Mass. 



Rowe, Mass. 

 Fairhaven, Vt. 

 Sutherland Falls, Vt. 

 Thetford, Yt. 

 Yernon, Yt. 

 Yershire, Yt. 



Pyrrhotite and pyrite 



Pyrite and marcasite. 



Pyrrhotite, with pyrite. 



Arsenopyrite. 



Marcasite. 



Marcasite, in drusy tlakes. 



Pyrite in cubes. 



Marcasite, arsenopyrite. 



pyrite in octahedra, and 



pyrrhotite. 

 Pyrite, efflorescing into 



alum and copperas. 

 Pyrite and arsenopyrite. 



Rock-Matrix. 



Granular limestone. 



Granite. 



Yein in Laurentian granite 

 and horn blend yte. 



Magnesian limestone. 

 Trenton limestone. 

 Chlorite slate. 



Mica slate. 



and mica schist. 

 White marble. 



Pyrite, decomposing into Marble, hydro mica slate 

 iron-ochre. 



Pyrite, efflorescing into 

 alum, and chalcopyrite. 



Pyrite, in brilliant cubes Blue-gray dolomyte. 

 and grains, sometimes! 

 assuming a coppery tar- 

 nish. 



j Pyrite. Limestone. 



( Pyrite and pyrrhotite. Hydro-mica slate. 



Pyrite in minute modified White magnesian marble, 

 cubes, quickly decom-j 

 posing to iron-ochre. 



Marcasite, massive and fi- 

 brous. 



Pyrrhotite and pyrite. 

 Pyrite. 



Pyrite, 



Pyrite, in small fine- 

 grained bunches. 

 Pyrrhotite. 



Mica-slate. 



Vein in gneiss. 



Roofing-slate. 



Pyrite. 



Pyrite, chalcop} T rite, and 

 "arsenopyrite. 



Argillaceous bands in 

 white marble. 



Roofing-slate. 



