NO. 2339. ACCESSIONS IN APPLIED GEOLOGY— SHANNON. 325 



Hubnerite, the manganese end member of the wolframite series, is 

 also well represented by large and fine specimens, especially note- 

 worthy being one from the Tungstonia mine, White Pine County, 

 Nevada (Cat. 90274), and several specimens showing blades up to 

 several inches in length of bronzy hubnerite in white quartz from the 

 Blue Wing District, Lemhi County, Idaho (Cat. 88123). The latter 

 specimens were received from Messrs. C. H. Hussey, M. S. Dufheld, 

 and F. L. Woods. 



A rare and unique tungsten ore is a large specimen of the newly 

 discovered mineral tungstenite, a tungsten sulphide recently described 

 from the Emma Consolidated mine, at Alta, in Little Cottonwood 

 Canyon, Utah.^ This specimen (Cat. 90402) is the gift of Mr. William 

 Garrett Ridgley, of New York City. It shows a large mass of the 

 soft gray timgstenite, which resembles fine-grained molybdenite, 

 intimately mixed with pyrite, galena, and tetrahedrite. 



The series of tungsten ores exhibited is in all probability the finest 

 and most complete of its kind in the world, and is especially valuable, 

 since it contains all of the types which were recently used as the basis 

 of a profusely illustrated treatise on Tungsten Minerals and Deposits 

 by Mr. Hess.^ 



Molybdenum is a metal which is similar to tungsten in its properties 

 and also in the effect which it has upon the physical properties of 

 steels, with which it is alloyed. Indeed, molybdenum is said to be 

 more efficient than is tungsten for many of the same purposes, but 

 owing to its greater rarity and consequent higher price it is much less 

 generally used. The ores of molybdenum are less numerous than 

 are those of tungsten, the most important being the sulphide, molyb 

 denite, which is a soft scaly gray mineral resembling graphite. Les 

 important ores are molybdite, a hydrous ferric molybdate which 

 occurs as a yellow powder resembling tungstite, and wulfenite, lead 

 molybdate, which forms tabular yellow to orange crystals. The 

 series of molybdenum ores now exhibited is very complete; al 

 varieties of the ores and all important localities are abundantly 

 represented. Among important recent accessions may be mentioned 

 a large specimen of molybdenite from the Climax Molybdenum Co. 's 

 mine, Climax, Colorado (Cat. 90562), and a large amount of unusually 

 pure molybdite (Cat. 90761) from the same locality. Several very 

 large masses of molybdenite were recently received from the R. and S- 

 Molybdenum Co.'s mine in Taos County, New Mexico (Cat. 90738)- 



Vanadium is another of the metals important in alloy steel manu- 

 facture. Perhaps one of the most valuable and unique sets of ores 

 in the exhibition series is the collection of vanadium ores from Minas- 

 ragra, Peru (Cat. 89897-89905), collected for the museum by Mr. 



» R. C. VVolls ani B. S. But le r, Joura. Washington Academy ScL, vol. 7, pp. 596-599, !917. 

 » Frank L. Hess, U. S. Geological Survey, Bulletin 652, 1917. 



