1892.] natural sciences of philadelphia. 187 



Localities of Chester County. By William W. Jefferis. 



Four and a half miles northeast from West Chester in the town- 

 ship of Willistown, Chester County, there is a vein or bed of mag- 

 netite in serpentine, some of the specimens showing strong polarity. 

 This was opened about seventy years ago for chrome ore and some 

 five hundred pounds were taken out, but not being chromite the 

 mining was abandoned. 



The serpentine continues in a southwest course and is exposed in 

 West Goshen Township, north of West Chester, for a mile or more. 

 Three quarries have been ojiened for building stone. In one of 

 them, on the farm of the late General George A. McCall, is found 

 chrysotile in small veins. 



Ajfew hundred yards west of this is the quarry of AVilliam P. 

 Marshall, that has furnished many cabinet specimens of aragonite 

 in small radiated crystals. In seams of the serpentine, dolomite and 

 marmolite are also found. . 



On the adjacent ridge, drusy quartz was formerly very abundant, 

 also chalcedony and jasper. 



At the end of the serpentine ridge, west of Marshall's quarry is a 

 vein! of compact talc that was worked by an old mineralogist in 

 1834, with an idea of making pencils and supplying lyceums with 

 specimens. North of this, on the edge of the serpentine, staurolite 

 and garnets occur. 



Haifa mile further west is Taylor's quarry and from it have been 

 taken the following minerals: — radiated aragonite (called by the 

 old mineralogists of 1820, radiated carbonate of magnesia), dewey- 

 lite, kerolite, asbestus, and chromite in octahedral crystals. In the 

 road north of Mr. Taylor's house, staurolites and garnets were for- 

 merly abundant. 



On^the farm of Caleb 8. Cope, in East Bradford Township, one 

 mile west from Taylor's, is found talc, some of the specimens con- 

 taining yellow actinolite. Epidote in quartz also occurs. A short 

 distance west from the talc locality is an old quarry of magnesian 

 limestone which is very fetid when struck. 



In the edge of the quarry was found necronite and also cyanite 

 of a fine blue color, which at one time was quite plentiful in an old 

 dam breast adjoining. 



Gray cyanite in crystals occurs in a bed of mica schist at both 

 ends of the bridge over[the Brandywine at Cope's in East Bradford 

 Township. Blue and green cyanite are also found in the rocks 



