Hidden and Mackintosh — Oceurrena of Polycrase. 305 

 the unit brachydome. As the angles were obtained by i hand 



goniometer and arc only approximate they arc not considered 

 worthy ^\ record. 



With this mineral (o( which ten kilos have thus far been 

 mined), we have found only a few small pieces of allanite (Sp. 

 dr. = :')".*»4), and one Bmall mass of uraninite (0, having gum- 

 mite and uranotil as a coating, its density was 7*22, both species 

 of which are not found at the North Carolina Locality. The 

 exact situation of the new deposit is, just at this writing, un- 

 known to us, but it is near the u Upper Saluda River, just 

 over into South Carolina, and is distant about twenty miles 

 from the first described locality. 



The density of the new crystals varies between 4*925 and 

 5-038. 



The pure mineral was first pulverized and then rubbed very 

 tine, with alcohol, in an agate mortar. It then w r ent into per- 

 fect solution when boiled with sulphuric acid. Excepting that 

 it does not decrepitate before the blowpipe it is otherwise very 

 much like the North Carolina mineral. It is slightly harder 

 (6) and its streak and powder are pale snuff-brown, and darker 

 than the North Carolina mineral. 

 The analysis is as follows : — 



Oxygen ratio. 



Cb.O, ) ( 14-30) 



Ta 9 5 5- 47-88 J .... V? 



TiO a _.\ \ ( 33-58) 



Y o 3 ,etc... 21-23 At. w't. = 114-1 23-06 



PbO 0-46 0-20 



FeO 2-47 3*43 



Fe a O s 0-18 0-33' 



r0 3 19-47 _.. 20-35 



CaO 0-68 1-21 



H a O (Ign.) 4-46 '. 24-78 



Insoluble 0'12 



SiO a 1-01 



97*96 



Both of the analyses show a loss for which we cannot account, 

 though the presence of fluorine was unmistakably detected in 

 the South Carolina mineral. Thoria is absent in both cases. 



Our attempts at separation of the metallic acids, contained 

 in both the minerals, were very unsatisfactory. In fact the 

 method by fusion with sodium bisulphate, even when repeated 

 several times, did not give reliable results under our treatment. 

 Until we have separated the metallic acids present, entirely to 

 our satisfaction, we do not propose to offer any conjectural 

 formulae for these analyses. We will state though that this 



