42 TRANSACTIONS 0¥ THE [.TAN. 19, 



of a size fully one or one-and-a-half inches in diameter. Their 

 lustre is unusually permanent. They abound in veins of white 

 Calcite, which add greatly to the beauty of the specimens. 



Chalcopyrite is found in tetrahedral forms, with sunken or 

 hopper-shaped faces. Many of the ciystals exhibited a remark- 

 able iridescence. The parallelism of grouped crystals is shown 

 on an extensive scale. 



Aplome Garnets are occasionally found ; these are of a deep 

 brownish-red color. 



One of the most interestini:- minerals at this mine is Bi/s- 

 solite, a fibrous Hornblende as soft as silk. The color is a light 

 olive green, inclining to a blue rather than yellow. It invests 

 Calcite and other minerals with a thick coating, and also pene- 

 trates the Calcite, imparting to it a green hue of various de- 

 grees of depth. 



By holding a bit of the Calcite against a strong light, the 

 Byssolite fibres may be seen scattered in profusion in every direc- 

 tion. At other times the delicate fibre'^ ai*e scarcely to be 

 detected by the unaided eye, yet the Calcite shows their 

 presence by its color. Hydrochloric acid may be used to form 

 cavities in the matrix when the Byssolite may be noticed pro- 

 jecting into the cavity, unharmed by the application of the acid. 



Pyroxene occurs in small crystals, generally drusy, and 

 grouped into stalactitic forms of much beauty. In color they 

 are of a deep olive green, relieved by lighter shades. 



Among other minerals found in the mine are a number of 

 Zeolites, the most noticeable of which, perhaps, is Apophyllite, 

 appearing in handsomely modified forms, not as showy, however, 

 as specimens from Bergen Hill and Lake Superior. 



An amorphous mineral, resembling at first sight red Ortho- 

 close, is very abundant. Its nature has not yet been determined. 



De. a. a. Julien exhibited singular figures on Potsdam 

 sandstones. He also remarked upon the boulders at Far Rock- 

 away, Long Island, and their dispersion. 



January 19th, 1885. 

 Stated Meeting. 

 The President, Dr. J. S. Newberry, in the chair. 

 Thirty two persons present. 



