Chemical Examination of American Minerals. 55 



York, with a request that I would subject it to anew analysis, 

 assigning as a reason, that though Seybert's analysis was 

 excellent, he had perhaps operated upon poor specimens. 



The specimens were pure, with the exception of a few 

 crystals of aU)ite on one corner, and small irregular veins of 

 a gray colored mineral, seemingly quartz, visible in one of 

 the pieces. 



The color was reddi>h-yel]ovv ; the lustre considerable, 

 and inclining to resinous, indeed chondrodite has a con- 

 sidernble resemblance to garnet. 



Fracture filiated, Witli a cleavage which seemed to indi- 

 cate lor the primary form, a doubly ohliqiie 

 pri.-m. The iiicideiue of M on T about 75*^, 

 and that of P on T about 65". But as these 

 measurtnients. which were made v\iih the com- 

 mon goniometer, do not agree wiih tluse of 

 Ha y, they are prol>ably inaccurate. 



T!:e cross-fra> ture is grvinubir. 



Translucent on the edges. In thin fragments semi-trans- 

 parent. 



Easily scrat( bed by ilie Knife, but not by calcareous spar. 

 Seems about the same hardness as fluor spar. 



Brittle. 



Specific gravity of my specimens 3-118. D'Ohsson found 

 it 3-18 ; and Seybert, Iroui .3l.i7 to 3*2 J5. 



Df>es not fuse per se before ihe b'ow pipe. 



It dissolves withnut difficulty in nitric acid. Its constituents 

 were found to be, 



Silica, 



Magnesia, - 

 Peroxide of iron, 

 Fluoric acid. 

 Water, 



36-00 



54-64 



3-97 



3-75 



1-62 



99-98 



