176 PROCEEDINGS OF THE ACADEMY OF [1892. 



Uranochre, one specimen, probably this species. 



Garnet occurred, but the specimens were neither fine nor 

 abundant. One specimen of transparent or precious garnet was 

 found. 



Clialcopvrite and mahichite in poor specimens. 



Bismuthinite, one specimen, Avas found in the granite on the river 

 bank which afforded the fine orthoclase crystals. It is a small group 

 of crystals imbedded in tourmaline. 



Muscovite, biotite and pyriteand tw^o specimens of hyalite colored 

 yellow by uranium were found. 



Northeast of Fairmount, along the line of the Reading Railroad, 

 and to the north of the latter was high ground chiefly of gneiss, 

 probably the same as that at Fairmount but much decomposed. In 

 the granitic beds of this gneiss good crystals of muscovite occurred. 

 All this region has long been built over. 



Northwest of the Fairmount gneiss occur mica schists and horn- 

 blende schists which have been quarried along the Schuylkill and 

 in West Philadelphia. The minerals found in this region are not 

 numerous. On the left bank of the river about a quarter of a mile 

 above Fairmount, a promontory of gneiss including some syenite 

 formerly projected into the river, terminated by a rock covered dur- 

 ing high water, known as Turtle rock. When the Park drive along 

 the river was constructed, this rock was covered and the adjacent 

 bluff partly quarried away. Here a few quite good specimens of 

 chabazite were obtained, also hornblende in long bladed crystalliza- 

 tions. 



Between Turtle rock and Girard Avenue bridge, bucholzite was 

 formerly found. 



In the mica schists of the tunnel in the Park north of Girard 

 Avenue, and also in a quarry on Girard Avenue about 38th Street, 

 menaccanite occurred in rough crystals. At the tunnel Mr. Howard 

 Parker found a specimen in which three tabular crystals were 

 curved into concentric semi-circles, the inner one with a diameter of 

 two inches, the outer of three and a quarter inches. The crystals 

 were about one-eighth of an inch in thickness with a quartz parting 

 from to I of an inch ; a separate flat crystal occupied the radius of 

 the semicircleopposite the three. The exposed ends of these crystals 

 were broken but they were evidently upwards of two inches in 

 length alonir the axis of the semicircle. 



