1892.] NATURAL SCIENCES OF PHILADELPHIA, 189 



opened some of the corundiini contained the rare mineral euphyllite. 



There are no minerals of any note in the serpentine until we 

 reach the southern part of the county where sand chrome occurs in 

 abundance, and thousands of tons have been taken from the soil. 

 Hallite in hexagonal crystals occurs in a vein in East Nottingham 

 Township, also a hard asbestus in stick -like masses two feet long. 



In West Nottingham Township, crystals of chromite in octahe- 

 drons, roseite (a variety of jefferisite) staurolite, leelite and raagne- 

 site occur. Several excavations have been made in search of the 

 latter mineral and many tons of it were sent to Philadelphia to be 

 used in the manufacture of epsom salts. 



In the adjoining county of Lancaster, one-half mile from the Mary- 

 land line is the celebrated chrome mine known as " AVoods' mine." 

 The mine was opened about the year 1885 or 1840, and many thousand 

 tons of chromic iron have been taken from it. The vein was traced to 

 the depthof 700 feet, and m some places was 30 feet thick. It has not 

 been worked for the past ten years, and is now abandoned, and filled 

 with water and debris. About the year 1858 or 1860 brucite was found 

 in abundance, finely crystallized ; one of the veins of brucite being 

 a foot in thickness. The following minerals also were found at 

 this mine: — zaratite, kammererite, penninite, deweylite, ouvarovite, 

 picfolite, genthite, baltimorite, dolomite, hydrodolomite, aragonite 

 in delicate radiated ci-ystals and hematite in very fine cr}Stals with 

 penninite. All the minerals found within five miles of the mine 

 have been labelled from Texas, as follows : — williamsite, enstatite, 

 lancasterite, talc, magnetite crystals in chlorite, green tourmaline, 

 limonite pseudomorph after pyrite in modified crystals, steatite, 

 carnelian, jasper, moss agate and drusy quartz. 



In the western end of the township of West Town, three miles south 

 of West Chester is the celebrated Birmingham serpentine quarry, 

 perhaps better known as Brinton's quarry. The stone has been 

 used in the principal cities of the United States. The following 

 occur in the quarry: — clinochlore and jefferisite in finer specimens 

 than elsewhere ; deweylite, tourmaline, beryl, magnesite, talc, 

 aragonite, in radiated crystals on the serpentine, covering surfaces 

 three by two feet or more ; oligoclase, showing fine twinning lines; 

 magnetite, amethyst, etc. The crystals of clinochlore, are found in 

 pockets of talc in the solid serpentine, partially decomposed. 



There is also an outcrop of serpentine two and a half miles south- 

 west of West Chester with a vein of aquacreptite through it. This 



