8 On the Mineralogy of Chester County, Penn. fyc. 



Sulphuret of iron, in cubic crystals, occasionally truncated 

 on the angles, same locality. 



London Grove Township. 



Tremolite, in fibrous and radiated masses, in Ephraim Wil- 

 son's quarry. 



Phosphate of lime, perfectly transparent, of a rich bottle 

 green color, in hexahedral prisms and massive, on Allison's 

 farm ; this interesting locality was discovered by Dr. Alli- 

 son who has liberally distributed specimens among our 

 mineralogists. 



Tourmaline, of a beautiful velvet black, in hexahedral prisms, 

 terminated with trihedral faces, set on the lateral edges, on 

 William Jackson's farm. 



Red oxide of titanium, in tetrahedral prisms, with dihedral sum- 

 mits in gneiss, also massive, on Wm. Jackson's farm. 



Iserine, in tetrahedral prisms, truncated on the angles, and 

 longitudinally striated, in W. Jackson's lime quarry. 



Tremolite, crystallized, and in radiated fibres, same locality. 



Foliated and fine scaly talc, of a white color, in Mitchiner's 

 quarry, adjoining W. Jackson's. 



Brown tourmaline, in hexahedral prisms, in carbonate of lime, 

 a beautiful mineral, in W. Jackson's, and Pile & Morris- 

 son's lime quarries. 



Crystallized quartz,* in hexahedral prisms with pyramidal 

 summits, transparent, in Pile & Morrison's quarry. 



Brown spar, in rhombic crystals, slightly curved, of a brown- 

 ish color and beautiful pearly lustre, same locality. 



Fetid quartz, well characterized, same locality. 



Magnesian carbonate of lime, in rhombic masses and crystals, 

 same locality. 



Quartz, of a milk white color, on W. Jackson's farm. 



Cyanite. An interesting locality of cyanite in the primitive 

 form, has been discovered in this vicinity, by Dr. Allison. 



Garnets, in dodecahedral crystals, abundant in the gneiss 

 rocks, and detached, on W. Jackson's farm and neighbor- 

 hood ; a specimen in the museum of the West Chester 

 cabinet, measures 6.75 inches in circumference. 



* A specimen of limpid quartz from Morrison's quarry, presented to the cabi- 

 net of Natural Sciences by W. Jackson, and now in their museum, a hexahedral 

 prism with pyramidal termination, measures sixteen inches in circumference. 



