280 PROCEEDINGS OF THE ACADEMY OF [1880. 



A Kew Locality for Amethyst.— Mr. W. W. Jefferis announced 

 that Amethj'sts, well cr3'stallized, and of a rich purple color, had 

 been found this spring, for the first time, in the northern part of 

 Newlin Township, Chester Count}'. They were brought to the 

 surface by deep plowing, and were supposed to be derived from 

 a vein of this mineral. 



September 22, 1879. 



A New Corundum Locality. — Mr. W. W. Jefferis remarked 

 that a vein of blue Corundum, similar to that found in North 

 Carolina, was struck, on the south side of the Serpentine Kidge, 

 in Newlin Township, Chester County, a short time since. The 

 vein is well defined, being between walls of Culsageeite, in large 

 plates of a yellowish green color. Over 500 lbs. of massive blue 

 corundum has been taken out within ten feet of the surface. 



The llinerals of Surry County, N. G. — Mr. H. C. Lewis commu- 

 nicated the following list of minerals which he had found near 

 Dobson, Surry Co., N. C, during a recent visit to that locality :— 



Native sulphur, galena, pyrrhotite, p3n'ite,chalcopyrite, hematite, 

 menaccanite, magnetite, limonite, hausmannite, psilomelane, wad, 

 hornblende, actinolite, asbestos, garnet, talc, steatite, ripidolite, 

 chlorite. 



The psilomelane occurred in a bed about 18 feet in thickness. 



The magnetite was frequently polar. Native sulphur occurred 

 in cavities in quartzite as a coarse loose powder of rounded wax- 

 like grains, and was the result of the decomposition of pyrite. 



It was also stated that rutile occurred in Alexander Co., N. C. — 

 a new locality. 



Fossil (?) Casts in Sandstone. — Dr. J. M. Cardeza exhibited 

 specimens of quartz sandstone (Potsdam?) which he had found 

 lying loose upon the soil at Dutton's Mills, Pa., in which were 

 oblong rounded casts of sandstone, about an inch in length, and 

 similar to one another in shape. It was questioned whether they 

 mioht not be fossils. 



*» 



On a Peculiar Stratification in Gneiss. — Mr. Theodore D, 

 Rand stated that while much of the porphyritic gneiss of the belt 

 running southwest from the Falls of Schuylkill at the surface was 

 in rounded boulder-like masses, which had been mistaken for trap, 

 some of it presents at the surface a thin-bedded structure with, 

 apparently, very distinct stratification. Recently the cut of the 

 Pennsylvania Railroad through this belt, between Merion and Elm 

 Stations, about a mile from the boundary of the City of Philadel- 

 phia, has been widened, and on the south side ma}^ be seen an 

 interesting section. A mass of the gneiss, perhaps 15 feet across, 



