JOURNAL 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. Ill, MARCH 19, 1913 No. 6 



MINERALOGY. — Calcium vanadates fro7n Peru, Colorado and 

 Utah. W. F. HiLLEBRAND, Bureau of Standards, Fred, E. 

 Wright and H. E. Merwin, Geophysical Laboratory. 



Among the vanadium minerals brought to this country from 

 Minasragra, Peru, a number of years ago by Mr. Foster Hewett 

 and briefly described by him were two, the one red the other 

 orange, which analyses made by one of us (H) at the time showed 

 to be hydrous calcium vanadates, probably hexavanadates. 



Later, the senior author (H) received at different times from 

 Messrs. T. F. V. Curran, A. G. McNaughton and R. H. McMillen, 

 a red vanadium mineral from western Colorado, found in the Joe 

 Dandy claim of the General Vanadium Company of America, 

 Paradox Valley, Montrose County, about 12 miles from Naturita. 

 This mineral, impregnating and filling cavities in a friable sand- 

 stone, closely resembles one of those from Peru. 



Still more recently, samples of similar minerals from an unknown 

 location in Paradox Valley and from Thompsons, in eastern 

 Utah, were shown us by Mr. Frank L. Hess of the U. S. Geo- 

 logical Survey. Optical evidence proves that the one from Para- 

 dox Valley is the same as the red vanadate from Peru. The 

 other, from Thompsons, Utah, as also the mineral from the Joe 

 Dandy claim, differs in habit and also optically in some respects 

 from the Peruvian mineral, tho chemically there is qualitative 

 if not quantitative similarity. 



The object of this note is to secure our right to study further 

 and to name these minerals. An important feature of work still 



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