GEOLOGICAL AND MINERALOGICAL NOTES. 183 



Found at the Luther Noyes copper mine, the Chipman 

 silver mine and at Kent's Island, Newbury, the Stephen 

 Osgood mine in South Georgetown and the old Governor 

 Endicott copper mine in Topsüeld. 

 No. 9. Sphalerite : Zinc Blende. 



This occurs in considerable masses at all of the mines 

 in Newbury, Newburyport and Rowley, and also in much 

 larger quantities in the John Pettingale mine at Ames- 

 bury. 

 No. 10. Pyrrhotite : nickel Ore. 



From the Luther Noyes nickel mine in Newbury and 

 in a small vein exposed in the augite-syenite at Poor 

 House hill in Beverly. 

 No. 11. Pyrite: Iron Pyrites. 



This occurs in large masses near the Harriman mine at 

 Boxford, and in Newbury in connection with the galena 

 and silver ores. This is also common in small quantities 

 in nearly all of the bed rocks of the county. 

 No. 12. Marcasite : White Iron Pyrites. 



Found in large masses at the Luther Noyes nickel mine, 

 Newbury. 

 No. 13. Arsenopyrite : Mispickle. 



This occurs in thin sheets or veins at the John Pettin- 

 gale mine, Amesbury, and good specimens were found at 

 an old mine near the River Parker, Rowley. 

 No. 14. Tetrahedrite : Gray Copper. 



Good specimens of this mineral were found in the dump 

 heaps of the Chipman silver mine, Newbury, and at the 

 Stephen Osgood mine, South Georgetown. 

 No. 15. Halite: Salt. 



Found as incrustations and in acicular crystals on rocks 

 and the borders of tide pools at the sea shore. 

 No. 16. Fluorite : Fluor Spar. 



In irregulär, crystalline masses in the granitite at the 



