ECONOMIC GEOLOGY 233 



ZINC 



Sphalerite, zinc blende; sulphide of zinc. Associated with 

 galena at lead 'mines in Sullivan, Ulster and Orange co-unities; 

 An cram, Columbia county; Flat creek, Montgomery county; 

 Salisbury, Herkimer county; Martinsburg, Lewisburg, Lewis 

 county; Cooper's Falls, Mineral Point, and in Fowler, St Law- 

 rence county. ' 



MANGANESE 



Wad, earthy manganese, bog manganese. In town of Austerlitz, 

 Columbia county, are several localities; also in Hillsdale and 

 Canaan, same county; smaller deposits near Houseville, Lewis 

 county, and southeast of Warwick, Orange county. 



NICKEL 



Millerite, sulphide of nickel. Sterling iron mine, Antwerp, Jeffer- 

 son county, famous for crystalline forms. 



MOLYBDENUM 



Molybdenite; sulphide of molybdenum. West Point and near 

 Warwick, Orange county; Philips mine, Putnam county; Clinton 

 county, but sparingly, in granite rocks. 



NON-METALLIC MINERALS 



Under the head of non-metallic minerals which have a com- 

 mercial value but do not occur in New York in a quantity large 

 enough to be of economic importance, may be enumerated apatite, 

 asbestus, barite, biotite, calcite, fluorite, magnesite, muscovite and 

 serpentine. The principal localities for these minerals are given 

 herewith : 



Apatite; phosphate of lime. Hammond, St Lawrence county, 

 crystalline, with calcite, zinc ore and feldspar; near Gouverneur, 

 St Lawrence county, crystals in calcite, Vrooman lake, Jefferson 

 county; Greenfield, Saratoga county; near Hammonds ville, 

 Essex county; with magnetite in some of iron ores near Port 

 Henry; other localities of occurrence. 



Barite, barytes, heavy spar; sulphate of baryta. Ancram, Colum- 

 bia county; near Schoharie Courthouse, with strontianite, in the 



