Decomposition of Iron Pyrites. 



397 



Locality 



Kind op Pyrites. 



Rock -Matrix, 



I 

 Ducktown, Tenn. Pyrrhotite, with a little Veins in mica slate. 



chalcopyrite. 

 Sevier and Cocke Co. , Pyrite, passing into alum Argillyte of the "alum 



Tenn. ! and alunogen. | caves." 



Greensboro. N.C. and Pyrite. brilliant and au- Veins in granitoid gneisses 



the Piedmont region riferous, with chalcopy 



of X. C. 



Ore Knob. N. C. 



Richmond, Va. 



Louisa Co., Va. 

 Baltimore. Md. 

 Chester Co,, Pa. 

 Radnor. Pa. 

 Lancaster, Pa. 



rite 

 Pyrrhotite, with a little 



pyrite and chalcopyrite. 

 Pyrite and mareasite. 



i Pyrite. partly decomposed, 



and chalcopyrite. 

 Pyrite and chalcopyrite. 



Pyrite. 



Pyrite in brilliant cubes. 



i 



Pyrite in cubes. 



Gap Mine Lancaster Pyrrhotite and niekelife 



Co., Pa. 



Cornwall. Lebanon 

 Co., Pa. 



Pottstown. n'r French 



Creek, Pa. 

 Mahanoy City, Pa. 



Scranton, Pa. 



H ardstow n , Morris 



Co.. N. J. 

 Franklin, X. J. 



Perth Amboy. N. J. 



Jersey City and Wee 

 hawken, N. J. 



Xew York Island. 



Westchester Co.,N. Y. 



Cortlandt, N. Y. 



Edenville, Orange 

 Co., N.Y. 



rous pyrite. 

 Pyrite, cobaltiferous, in 



lustrous cubo-octahedra. 



and chalcopyrite. 

 Pj'rite, in brilliant octa- 



hedra. 

 Pyrite, in dull octahedra. 



Pyrite. 



Pyrrhotite. 



Arsenopyrite. 



Pyrite in radiated nodules. 



Pyrite in brilliant, smooth 

 octahedra, with a little 

 chalcop} T rite. 



Pyrite in bright octahedra 

 and granular flakes, ef- 

 florescing into alum ; 

 also chalcopyrite and 

 mareasite. 



Pyrite. pyrrhotite, and 

 chalcopyrite. 



Pyrite and pyrrhotite. 



Arsenopyrite and pyrrho- 

 tite. 



ind in diorytes. 

 Vein in hornblende-schist. 

 Coal and associated shales. 



Limestone, slate, etc. 



Slaty limestone. 



Magnetite and calcite vein. 



Bituminous coal and asso- 

 ciated shales. 



Anthracite and associated 

 slates. 



Granular limestone. 



Cretaceous clays. 



Calcite veins in dykes of 

 Mesozoic diabase. 



Gneiss and mica-schist. 



Granular limestone. 

 Granite, dioryte, etc. 

 Granular limestone. 



