161S] VICINITY OF PHILADELPHIA. 47V 



Cyanite\ Kyanit. W. Disthene, H. Sappare, Sau. 



This very beautiful and interesting mineral, occurs 

 crystallized in the gneiss rocks on Springfield road, about 

 two hundred yards from Darby bridge. Colour varies 

 from a very light to a dark Prussian blue. It is generally 

 darkest in a longitudinal line along the nuddie of the 

 crystal, which is for the most part an elongated table. At 

 the eleventh mile stone on the Wilmington road, it is 

 found more abundant, but less pure; crystals generally de- 

 tached and almost black. On the road to the Lazaretto it 

 occurs blue; also about eight miles up the Schuylkill. On 

 the Wichicon, about four miles from its mouth, associ- 

 ated with staurotide and garnets, in micaceous schistus; 

 but in small quantities. It was first observed by Mr. S, 

 Elliot in this vicinity. 



Actynolite. Variety of Amphibole. H. Strahlstein, W. 



On the Wichicon, about ten miles from the city, op- 

 posite a to large mill, half a mile below the bridge, acty- 

 nolite is found in acicular crystals, of a green colour, 

 imbedded in soapstone rock. Mr. Conrad found it in 

 large masses at Concord, Chester county. 



Tremolite, Tremolith.' W. Variety of Amphibole. H. 



I have seen this but in one place in the neighbour- 

 hood of this city, viz. at London grove. It here exists in 

 considerable quantities, in the limestone quarries of Mr. 

 John Jackson, both bladed and fibrous, of a beautiful 

 white. In some instances the fibres are so minute, as to 

 render it almost compact. 



