186 PROCEEDINGS OF THE ACADEMY OF [1892. 



About half a mile east of Henderson Station pyrite altered into 

 linionite occurs in good specimens. 



Southwest of the Schuylkill, on each side of the Laurentian hill 

 above mentioned, is a line of serpentine outcrops, beginning on the 

 northwest side about three miles from the river and extending thence 

 nearly in a straight line to a point northwest of West Chester. 

 On the southeast side of the Laurentian there is a very small outcrop 

 northeast of the Schuylkill. Southwest of the river, but close to it, 

 is Rose's quarry before mentioned ; thence the belt stretches south- 

 westward almost continuously through Lower INIeriou, Radnor, 

 IMarple and Newtown Townships. On this belt few quarries or 

 mines have been opened, Rose's quarry, as before mentioned, yielded 

 enstatite, asbestus, Schiller spar and antigorite. 



At Rosemont, where the Pennsylvania Railroad passes this belt, 

 was a quarry, now built over, which afforded a fibrous aragonite. 



Where the road from Philadelphia to West Chester crosses the 

 railroad, about a mile east of Newtown Square, remarkable speci- 

 mens of stalactitic quartz were once found in digging to lay the 

 foundation of a stone wall. The cavities were from one to four 

 inches wide and the stalactites depending, both in the ordinary 

 form and also in curtain-like sheets, formed specimens of great 

 beauty. Further southwest, in the same belt, was Moro Phillips' 

 chrome mine referred to in Dr. Cardeza's notes. 



Close by, but probably in a serpentine not connected with the 

 Laurentian, antholite occurs in quantity and in good specimens. 



In the belt northwest of the Laurentian, about one-half a mile 

 northwest of Radnor Station, a quarry was opened on land then 

 belonging to John Stacker. In this quarry, and in the vicinity, the 

 following minerals were found : — asbestus, mountain cork, marmolite, 

 chromite, chalcedony, cacholong, drusy quartz, deweylite, genthite, 

 enstatite, dermatin (?), serpentine pseudomorph after asbestus, 

 quartz pseudomorph after asbestus, pimelite, chrysotile, vermiculite. 



In the mica schist of Cream Valley, about a mile northwest of 

 Radnor Station, crystals of garnet sometimes an inch in diameter 

 and usually distorted, associated with staurolite are abundant. In 

 the limestone of the same valley, about a mile north of Radnor 

 Station, small brilliant cubes of pyrite were at one time abundant, 

 many of them curiously elongated and flattened. 



In the Potsdam sandstone of Cream Valley minute tourmalines 

 are abundant, occurring occasionally in crystals an inch or more in 

 length. 



