19211 



NATURAL SCIENCES OF PHILADELPHIA 



175 



Contour mti'r\-uJ ^'O t> c-l 



Fig. 2. — Albitite and plumasite occurrences of the West Chester quadrangle, 

 Chester County, Penna. B, Brinton's serpentine quarry, containing veins of 

 albitite; Co. abandoned corundum mines in plumasite near Union ville. 



