238 REPORT OF NATIONAL MUSEUM, 1899. 



cessation of the spring-action, surface-creep of the residual mantle from the higher por- 

 tions of tlie ridges covered the deposits to varying deptlis, as they are found at present. 

 A small portion of the ferrous sulphate was oxidized and precipitated along with 

 the bauxite, but the greater part was carried some distance from the springs and 

 slowly oxidized, forming the widespread deposits of limonite in this region. 



Uses. — The better known use of bauxite is as an ore of ahuninuin, 

 for which purpose it lies beyond the scope of the present work. It 

 may, however, be well to state that before the aluminum can be satis- 

 factorily extracted the ore is purified by chemical processes. The 

 principal use is for the manufacture of alums and other aliuuinum 

 salts such as are used in the manufacture of })aking- powders and d3^es. 

 It is believed that the mineral, owing to its highly refractive qualities, 

 will in the near future be utilized in the manufacture of lire ])rick and 

 crucibles. An alumi no-ferric cake, a b3"-product obtained in the puri- 

 fying process, is claimed as of value for sanitary and deodorizing 

 purposes. The price of the crude ore varies greatly, according to 

 purity. The average price for the past few years has been about $5 



a ton. 



BIBLIOGRAPHY OF CRYOLITE AND BAUXITE. 



Paul Quale. Account of the Cryolite of Greenland. 



Annual Report of the Smithsonian Institution, 1S66, p. 398. 

 M. H. CoQUAND. Sur les Bauxites de la chainedes Alpines (Bouches-du-Rhone) et 

 leur age geologique. 



Bulletin de la Societe Geologique de France, 2d ser., XXVIII, 1870-71, pp. 

 98-115. 

 Edward Nichols. An Aluminum Ore. 



Transactions of the American Institute of Mining Engineers, XVI, 1887, p. 905. 

 P. JoHNSTRUP. Sur le Gisement de la Kryolithe au Greenland. 



Bulletin de la Societe Mineralogie of France, II, 1888, j). 167. 

 M. AuGE. Note sur la Bauxite, son origine, son dge et son importance geologique. 



Bulletin de la Societe Geologique de France, 3d ser., XVI, 1888, \). 345. 

 Stainslas Meunier. Response a des observations de M. Auge et de M. A. de Gros- 

 souvre sur I'histoire de la Bauxite et des Minerals Siderolithiques. 



Bulletin de la Societe Geologique de France, 3d ser., XVII, 1889, p. 61. 

 R. L. Packard. Aluminum. 



Mineral Resources of the United States, 1891, p. 147. 



This paper contains numerous references to which the present compiler has 

 not had access. 

 Henry McCalley. Bauxite. 



The Mineral Industry, II, 1893, p. 57. 

 Bauxite Mining. 



Science, XXIII, 1894, p. 29. 

 C. Willard Hayes. The Geological Relations of the Southern Appalachian Bauxite 

 Deposits. 



Transactions of the American Institute of Mining Engineers, XXIV, 1894, jj. 243. 

 W. P. Blake. Alunogen and Bauxite of New Mexico. 



Transactions of the American Institute of Mining Engineers, XXIV, 1894, p. 571. 

 Francis Laur. The Bauxites. A Study of a new INIineralogical Family. 



Transactions of the American Institute of Mining Engineers, XXIV, 1894, p. 234. 

 On Bauxite. 



Minutes of the Proceedings of the Institute Civil Eng., CXX, 1894-1895, pt. 2, 

 p. 442. 



