MINERAL RESOURCES OF THE STATE OF NEW YORK 281 



tiations are proceeding for the acquirement of the other quarries 

 along the river front. 



The future of the industry in this section is somewhat unsettled. 

 It is not unlikely that new quarries may be opened on top of the 

 ridge and in the interior of Rockland county, though the facilities 

 for production and shipment in that section can scarcely be equal 

 to those of the present localities. 



References to Stone 

 Dickinson H. T. Quarries of Bluestone and other Sandstones in New York. 



N. Y. State Mus. Bui. 61, 1903 

 Eckel, E. C. The Quarry Industry of Southeastern New York. N. Y. State 



Geol. 20th Ann. Rep't, 1902 

 Hall, James. Report on Building Stone. N. Y. State Mus. 39th Ann. Rep't, 



1886 



Geology of New York. Rept. on Fourth District, 1843 



Mather, W. W. Geology of New York. Report on First District, 1842 

 Merrill, F. J. H. Mineral Resources of New York, N. Y. State Mus. Bui. 



15, 1895 

 Merrill, George P. & Others. The Building Stones of the United States. Report 



of the loth Census, v. 10, 1884 

 Newland, D. H. The Quarry Materials of New York — Granite, Gneiss, Trap and 



Marble. N. Y. State Mus. Bui. 181, 1916 

 Smock, John C. Building Stone in the State of New York. N. Y. State Mus. 



Bui. 3, 1888 



Building Stone in New York. N. Y. State Mus. Bui. 10, 1890 



Vanuxem, Lardner. Geology of New York. Report on Third District, 1843 



STRONTIUM 



The principal strontium minerals are celestite, the sulphate, and 

 strontianite, the carbonate; both are clear, transparent or translucent 

 white substances that resemble the corresponding barium compounds. 

 They are found in veins, geodes and concretionary masses, usually 

 in limestone country and frequently associated with calcite. Baryto- 

 celestite is a mixture of the sulphates of barium and strontium. 

 Unlike barite, celestite finds little employment in its natural state, 

 but is used for the preparation of other salts. 



The strontitmi compounds have rather limited applications in 

 industry. Until recently they have not been in large request and 

 most of the requirements have been supplied by imports from 

 abroad. The chief commercial salt is the nitrate which is consimied 

 mainly in the manufacture of fireworks and night signals, being 

 employed to produce the red color that is characteristic of strontium 

 compounds when heated to incandescence. Recently a demand has 

 developed for the hydroxide in connection with sugar refining, 

 particularly in the beet sugar industry, of which the use is said to 



