6 On the Mineralogy of Chester County, Penn. fyc 



Sulphuret of iron, in cubic crystals, same locality. 



Mica, of a grass green color, beautifully striated, near Brandy- 

 wine bridge, Ihree miles west of Chester county poor 

 house. 





East Marlborough Township. 



Iserine, in detached crystals and granular masses, at David 

 Persey's mill race, also in quartz, in tetrahedral prisms stri- 

 ated, in John Baily's lime quarry. 



Tremolite, beautifully crystallized, in oblique four sjded prisms, 

 the acute lateral edges truncated with dihedral summits, in 

 John Baily's lime quarry. 



Sulphuret of iron, in cubic crystals occasionally truncated, on 

 all its angles, also in dodecahedrons, in John Baily's lime 

 quarries. 



Epidote, in hexahedral prisms, sometimes truncated on the 

 edges, of a yellowish green color, on Isaac Taylor's farm, 

 adjoining John Baily's, south. 



Foliated talc, white and green, on A. Marshall's farm, also on 

 McCloud's, adjoining. 



West Marlborough Township. 



Phosphate of lime, in hexahedral prisms, of a yellowish green 

 color, in granular limestone, in Bernard's quarry. 



Iserine. Beautiful specimens of this mineral occur in tetra- 

 hedral prisms, truncated on the angles, longitudinally stri- 

 ated, with oblique summits, in Bernard's lime quarry. 



Brown spar, in small rhombic crystals, with the planes slight- 

 ly curved, in Bernard's lime quarry. 



Dogtooth spar, (carb. of lime) in semi transparent straw col- 

 ored crystals, McNeal's lime quarry. 



New Garden Township. 



Fibrolite, of a greyish white color, in little bundles of deli- 

 cate fibres and acicular crystals intimately connected, on 

 Nathan Scarlet's farm, south of Phillips' quarry. 



Black schorl, in cylindrical crystals and fibres, a very beauti- 

 ful variety of this mineral, same locality. 



Phosphate of lime, in hexahedral prisms, of a green color, 

 same locality. 



Garnets, in dodecahedral crystals, of a deep red color, in mica 

 slate, same locality. 



Fibrous carbonate of lime, in J. Phillip's lime quarry. 



