BULLtTIN OF THE SCIENTIFIC LABORATORIES OF DENISON UNIVERSITY. 

 Vol. XII. Article III. August, igoa 



ON THE OCCURRENCE OF URANOPHANE IN 



GEORGIA.' 



Bv Thomas L. Watson. 



The object of this paper is to describe the occurrence of 

 the rare mineral uranophane from a new locality. State Geol- 

 gist Yeates first observed the occurrence of the yellow mineral 

 at Stone Mountain, Georgia, in the early nineties and later had 

 Mr. R. L. Packard examine the material chemically in the lab- 

 oratory of the Georgia Survey. During 1898 and 1899, while 

 engaged in a field study of the Georgia granites, the writer 

 independently noted the occurrence of this mineral at the same 

 locality, as a thin, yellow incrustation coating the faces of many 

 of the joint planes cutting the Stone Mountain granite mass. 

 Specimens were carefully collected and studied in the labora- 

 tory of the Survey in Atlanta. 



So far as the writer can ascertain, uranophane is reported 

 from only one locality in the United States, namely, Mitchell 

 county, North Carolina.^ Here the mineral is found incrusting 

 and penetrating gummite as an alteration product at the mica 

 mines. Under the title ''On Some New Mineral Occurrences 

 in Canada," G. Chr. Hoffmair'^ of the Canadian Geological 

 Survey lias recently described the occurrence of uranophane 

 from Ottawa county, Quebec. According to Hoffman, the 

 mineral in Quebec is associated with "gummite, uraninite, 

 black tourmaline, white, light gray, pale olive-green and bluish 

 green apatite, spessartite, monazite, and green and purple 

 fluorite, in a coarse pegmatite vein composed of white and light 

 to dark, smoky-brown quartz, microcline and muscovite, which 

 traverses a gray garnetiferous gneiss." The mineral is further 



'Reprinted from the American Journal of Science, fourth series, Vol. 

 XIII, pp. 464-466, 1902. 



■'Dana, E. S., A System of Mineralogy, 1893, P- 699. 

 ■^ Am. Jour. Sci.^ 11, pp. 152-153, 1901. 



