1892.] NATURAL SCIENCES OF PHILADELPHIA. 193 



per, chalcopyrite, malachite, azurite, si)halei-ite, calamine, laumonite, 

 calcite, fliiorite, limouite, native sulphur, oxide of manganese, pyrite, 

 barite, covellite, quartz and dolomite, melaconite, quartz pseudo- 

 morph after calcite, ankerite. 



Localities of Delaware County. By J. T. M. Cardeza, M. D. 



The chief localities for minerals in Delaware County occur in 

 gneissic beds, many of which are isolated in areas of more schistose 

 rocks, or in or near the serpentine outcrops Avhich abound in the 

 central part of the County. 



Perhaps the more prolific localities have been in or near the 

 Townships of Kidley and Middletown. 



Ridley Township. East of Chester and north of the River 

 Delaware, large quarries have been wrought for many years chiefly 

 in fine grained micaceous gneiss of considerable value for building 

 purposes and for curbstones. Of these Deshong and Leiper's on 

 Ridley Creek and Leiper and Lewis' on Crum Creek are most 

 noted. The gneiss itself contains rarely small garnets and tourma- 

 line, the rarer minerals occurring in coarse granitic veins, beds 

 or segregations in the gneiss. 



At Deshong's quarry, as at Leiper's on Ridley Creek, the two 

 being in the same bed, good-sized brilliant garnets have been found 

 together with beryl in hexagonal prisms one-eighth of an inch to 

 one and one-half inches in diameter and from one inch to twelve 

 inches in length, usually pale green and translucent, occasionally 

 bright green and transparent, and a number Avith fine well 

 terminated crystals. I have a specimen in my cabinet with replace- 

 ments of the prism fjaces giving it the appearance of a cylinder. 

 Small well terminated crystals of yellow beryl were found here. 



Beryls, some terminated, altered into a granular white substance 

 were recently found. I have in my possession a beryl from this 

 locality, one foot long, two inches in diameter, lying on a bed of crys- 

 tallized feldspar. Some very fine specimens of tourmaline occur, but 

 being vexy fragile, are rarely obtained entire ; muscovite is abundant 

 but poor. Autunnite and torbernite, in good specimens, in coarse 

 granite, have been obtained ; also more rarely uranochre. Fine crys- 

 tals of orthoclase of different forms have been found, both singly and 

 in groups, the crystals from oue-half an inch to six or eight inches 

 in length. In a pocket was found thulite of a beautiful pink color; 

 of this there were very fine specimens, some honeycombed and some 



