358 Supposed New Mineral Species. 



rected anev/ to the subject, by receiving from him a specimen of 

 the Phillipstown mineral, along with the following remarks. " I 

 send a specimen of a mineral found in Canada, and near West 

 Point. It was ticketed Sphene, but its measure on the only faces 

 I have found, differs from Sphene, and every other mineral I am 

 acquainted with. It splits parallel to the planes of a rhombic 

 prism of about 125'^ 15'. I conclude that it is an undescribed 

 substance. Can you find it in crystals ?" 



In reply to which, I referred Mr. Brooke to the note in my 

 Treatise above alluded to, and transmitted him specimens from 

 Canada, upon which in a letter of 1838, he remarks again as fol- 

 lows: "Dr. FoRCHAMMER, of Copenhagen, took specimens of the 

 Canada Sphene with him last year to analyze, and I expect his 

 results shortly. I have the angle of the Canada variety 125° 

 30', instead of 123° 30'." 



Nothing farther, to elucidate the subject, had transpired last 

 October, when I had an opportunity of examining, with Mr. 

 Brooke, in his own cabinet, the specimens he possessed from 

 the localities above mentioned. 



On a visit to the mineral district of St. Lawrence county, 

 (N. Y.,) in company with Baron Lederer, of New York, and 

 Capt. Williams, of Bristol, Conn., I had the pleasure of obtain- 

 ing from two recently discovered localities, highly perfect crystals 

 of the mineral under consideration. One of these was on Mr. 

 Cleveland's farm, near a place called Natural Bridge, in Lewis 

 county, where it occurs in small quantity, in coarse granular 

 limestone, associated with a dark colored pyroxene, a pearl-blue 

 scapolite, (nuttallite,) and crystallized white feldspar. The other 

 locality is in a similar formation, at a spot called Robinson's mine, 

 two miles from the Rossie lead mine in St. Lawrence county. 

 At this place the associated minerals are, (besides pyroxene, scap- 

 olite, and feldspar,) apatite in large green crystals, zircon, and 

 plumbago. 



The crystals vary much in size, from above an inch to one 

 eighth of an inch in diameter, and are variously blended up with, 

 and implanted upon, some one or all of the above mentioned 

 species. 



The primary form of the crystals is an oblique rhombic prism, 

 whose bases are oblique, from an obtuse edge ; the inclinations 

 being M on M=112° 10' and M on P=115° 30'. Several crys- 

 tals of this form were observed at Natural Bridge. 



