On the Mineralogy of Bucks County, Penn. fyc. 1 3 



Phosphate of lime, in six sided prisms, terminated by six si- 

 ded pyramids, of a light green color, in quartz, same lo- 

 cality. 

 Iridescent feldspar, of a bluish white color, resembling the 

 Labrador spar, on the farm of Mr. Jacob Van Arsdalen, 

 three miles west of Attleboro,' and seven north of Bus- 

 tleton. 

 Tremolite, of a grass green color, in carbonate of lime, in 

 oblique tetrahedral prisms, having the acute edges trun- 

 cated, with dihedral summits, occasionally transparent, 

 Van Arsdalen's farm, same locality. 

 Actynolite, of a deep green color, same locality. 

 Mica, in six sided prisms, in granite, fibrous structure, in a 

 diagonal direction to the angles of the prism, in which 

 direction it may be cleaved, and numerous delicate fibres 

 separated, on the Penny pack creek, one mile south west 

 of Bustleton. 



For the discovery of the above localities, in Bucks county, 

 we are indebted to our friend Dr. Edward Swift, an indefati- 

 gable mineralogist of Bustleton, Penn. 



At the locality of tremolite, iridescent feldspar and acty- 

 nolite, on Jacob Van Arsdalen's farm, the following interes- 

 ting minerals, also occur, which render this locality suf- 

 ficiently attractive to mineralogists. 



1 . Tabular spar, in masses of several tons weight, analyzed 

 by Dr. Morton, and Mr. J. P. Wetherill, who obtained 

 the following constituents : — 



Silex, - - - - 51.50 



Lame, .... 44.10 



Oxide of iron, ... 1.00 



Lost by calcination, - - .75 



97.35 

 Scapolite, massive and crystallized. 3. Pyroxene, in hex- 

 ahedral prisms. 4. Zircon, forme soustrative of Hauy. 5. 

 Mica, clove brown, and emerald green. 6. Blue quartz, 

 in small quantity. 7. Feldspar, massive, of a dark blue 

 color, also in rhombic prisms, with the terminal angles 

 truncated, Unitaire of Hauy. 8. Garnet, granular and in 

 small dodecahedral crystals. 9. Phosphate of lime, mas- 

 sive, and in hexahedral prisms. 10. Graphite, massive, 

 and in delicate hexagonal tables. 11. Sulphuret of iron, 

 massive, and in octohedral crystals. 12. Silico-calcareous? 

 oxide of titanium, in oblique four sided prisms. 



