3Y4 W. K Hidden— Minerals fro?n North Carolina. 



(in an analysis made on a few grams of material) so long as 

 competent chemists, working on many pounds of material, have 

 not only not found any means of accurate separation, but are not 

 even agreed as to the independent existence and number of the 

 earths to be separated." 



This Burke county fergusonite is thought to be identical 

 with Shepard's "rutherfordite," described from the same locality 

 many years ago on a very small amount of material. 



Allanite. — I have lately identified this mineral at two new 

 localities in North Carolina, i. e. at the emerald locality in 

 Alexander county, in the feldspar veins of the gneiss; and in a 

 decomposed feldspar at the Wiseman mica mine in Mitchell 

 county. At the first-mentioned locality the mineral occurs as 

 small, well-polished prisms, of a light brown color, sparsely 

 distributed in the feldspar (oligoclase for the most part), and is 

 not otherwise noteworthy excepting an unusually high per- 

 centage of La 2 3 , viz: 14 per cent. From the second named 

 locality the crystals are of unusually perfect form for allanite, 

 and contain over 8 per cent of yttria. Some of the crystals were 

 2 cm long and over l cm in thickness. They were all more or less 

 covered with a thin reddish-gray crust due to alteration. Some 

 few had become entirely altered into an allanite-gummite. 



Below is an analysis by Mallett on the purest material then 

 obtainable ; its color was pitchy black, through thin edges 

 slightly greenish : 



Si0 2 39-03' 88-60 



A1 2 3 14-33 12-58 



Y„0 3 8-20 20-83 



Ce 2 3 1-53 4-56 



Fe„0, 7-10 j ,,.,0 



FeO.? 5-22 1 1848 



The relatively small proportion of cerium, writes Professor 

 Mallett. and larger amount of yttrium, is remarkable, though 

 paralleled by a Norway orthite. The oxygen ratio is essentially 

 that of allanite and orthite. 



