CATALOGUE OF MINERALS FOUND IN COLORADO. 



By F. M. Endlich, S. K D. 



The continuous development of mineral resources of Colorado is pro- 

 ductive of a more complete knowledge, not only of their distribution, 

 but of their specific character. In 1873, I published my first catalogue 

 of minerals of that Territory. An enlarged list was printed in the 

 United States Geological Report for 1875. Now, the survey of Colorado 

 is completed, many additions of species new to the State and of new 

 localities for known ones have been obtained. With a view, therefore, 

 of presenting, as complete as possible, a catalogue of Colorado minerals 

 I have undertaken its preparation a third time. In so doing, I have 

 availed myself of all accessible material. Publications and private 

 communications by the following gentlemen have furnished very material 

 aid in the completion of the work: Dr. ¥. V. Hayden, United States 

 Geologist; Oapt. E. L. Berthoud, Golden, Colo.; Prof. J. D. Dana, IsTew 

 Haven, Conn.; Prof. P. Frazer, E. M., Philadelphia; Prof. F. A. Genth, 

 University of Pennsylvania, Philadelphia; E. Goldsmith, Philadelphia; 

 J. D. Hague, B. M., Survey of the Fortieth Parallel ; Prof. N. P. Hill, 

 Black Hawk, Colo. ; W. H. Holmes, United States Geological Survey ; 

 Dr. G. A. Koenig, Philadelphia ; Dr. O. Loew, Survey West of the One 

 Hundredth Meridian ; Prof. J. E. Mallett, jr., Canyon City, Colo. ; W. 

 McCree, E. M., Del Norte, Colo. ; Dr. A. C. Peale, United States Geolog- 

 ical Survey; Mr. Eichard Pearce, Black Hawk, Colo. ; Mr. Peters, E. M., 

 Fairplay, Colo. ; R. J. Raymond, United States Mining and Mineral 

 Commissioner; Prof. J. F. L. Schirmer, Denver, Colo.; A. von Schulz, 

 E. M., Black Hawk, Colo. ; Prof. B. Silliman, New Haven, Conn. ; J. 

 Alden Smith, State Geologist, Boulder City, Col. 



An arrangement has been followed diiiering somewhat from that 

 adopted in previous catalogues. So far as was possible, only well-accepted 

 mineral species have been enumerated, without according specific posi- 

 tions to the varieties. The most popular names for certain species have 

 been inserted, and references have been made leading to the name 

 accepted by mineralogists. It is intended that every available analysis 

 of Colorado minerals should be given. Necessarily many that have been 

 made and might prove valuable cannot be obtained. So far as possible 

 this intention has been carried out. Analyses of ores or metal-assays 

 are not given, as they would be of no mineralogical value, however inter- 

 esting to the miner and smelter. 



A systematic enumeration of the species occurring has been given at 

 the end of the catalogue. It is arranged in accordance with Dana's sys- 

 tem of mineralogy. In addition thereto, reference is made to publica- 

 tions bearing upon the mineralogy of the State of Colorado. 



Undoubtedly the most interesting mineral occurrence in Colorado is 

 that of the tellurides. Gold, silver, lead, iron, mercury, and oxygen are 

 combined with the tellurium, forming compounds that have either been 

 considered heretofore as among the rarest, or were totally unknown to 

 science. At no place have tellurides occurred in such large quantities 

 and in such admirable form. As ores they are greatly sought after on 

 account of the high percentages of gold and silver they contain. Another 



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