12 Bulletin of the New York State Museum. 



is one crystal of great beauty which shows these characteristics to 

 perfection. 



There is yet another form in which the calcite occurs. This, 

 though not as interesting as the other, is yet worthy of notice. In 

 this form the mineral appears in large, branching masses having much 

 the appearance of coral. These branches are made up of fine sca- 

 lenoheclrons coating the surface of larger crystals. Among these 

 branches are small, medium sized, and quite large crystals of celestite, 

 a mineral very common in this locality. 



According to Emmons, the vein in which these minerals occur cuts 

 through a gneiss formation. 



Associated with the calcite were found fine, large crystals of ga- 

 lenite ; pyrite. in cubic and octahedral ciystals ; sphalerite (in many 

 cases, crystals of exceptional beauty), and also celestite. 



Though Rossie has, without doubt, produced the finest crystals, 

 yet other towns in St. Lawrence county, have produced crystals 

 remarkable on account of their size. The neighboring county of 

 Jefferson has contributed the largest of any. In the Museum there 

 is a fine, large crystal from Oxbow, a post-office in Antwerp township, 

 measuring 12x10x10 inches. The crystal, though very bright and 

 fresh looking, has been attacked by weathering. Very large and 

 perfect scalenohedrons are also found in this locality. The Museum 

 has good representatives of these also. 



III. — PYROXENES FROM THE MINERAL LOCALITY AT 

 CHILSON HILL, TICONDEROGA, N. Y. 



The locality at Chilson Hill, Ticonderoga, Essex county, is the site 

 of the old graphite mine of the American Graphite Co. The mine has 

 now been abandoned for about thirty years. It was not abandoned on 

 account of exhaustion, but the great depth, the great influx of water, 

 together with the discovery of a new locality at Hague determined 

 its shut-down for a time. Though the new mine at Hague yields a 

 poorer grade of ore and is w T orked with greater difficulty, I am told 

 that on account of the heavier minerals with which it is associated and 

 which render washing and refining- so much easier, the new workings 

 pay much better. At Hague the graphite occurs in a gneiss vein, 

 while at Ticonderoga it occurs in a gangue of calcite. It is this vein 

 of calcite located in the gneiss which bears the minerals of this 

 locality. Here as in nearly all mines what is valued by mineralogists 



