05 NEW YORK STATE MUSEUM 



dikes. Brown tourmaline in r^mall crystals may sometimes be seen 

 in the Grenville limestone. 



Tremolite. See amphibole. 



Zircon. This is a silicate of zirconium harder than quartz or 

 flint ; of brown color ; without good cleavage ; and usually crystal- 

 lized as four-sided prisms capped by four-sided pyramids. 



Crystals up to one-half of an inch long are rarely seen in the 

 pegmatite. Microscopic crystals are nearly always present in small 

 amounts in the anorthosite, syenite-granite and gabbro. 



There are. of course, many other minerals which are very rare or 

 only locally developed in the Adirondack region, but the above list 

 includes about all that are commonly met. Anyone further inter- 

 ested in the recognition of Adirondack minerals should consult some 

 good book on mineralogy. 



BIBLIOGRAPHY 



Most of the more important papers and books which deal with, 

 or contain material on, the Adirondack region, are listed below. 

 There is no attempt at completeness. 



New York State Museum Bulletins 

 14 Kemp, J. F. Geology of Moriah and Westport Townships, 



Essex County. 1895. 38 p. 

 21 Kemp, J. F. Geology of the Lake Placid Region. 1898. 24 p. 

 70 Whitlock, H. P. New York Mineral Localities. 1903. no p. 

 /J Gushing, H. P. Geology^ of the Vicinity of Little Falls. 1905. 



98 p. 



84 Woodworth, J. B, Ancient Water Levels of the Champlain 



and Hudson Valleys. 1905. 206 p. 



85 Rafter, G. W, Hydrology of New York State. 1905. 902 p. 



95 Gushing, H. P. Geology of the Northern Adirondack Region. 



1905. 188 p. 



96 Ogilvie, I. H. Geolog}- of the Paradox Lake Quadrangle. 



1905. 54 p. 

 115 Gushing, H. P. Geology of the Long Lake Quadrangle. 



1907. 88 p. 

 119 NeviTland, D. H. & Kemp, J. F. Geology of the Adirondack 



Magnetic Iron Ores. 1908. 184 p. 

 126 Miller, W. J. Geology of the Remsen Quadrangle Including 



Trenton Falls and Vicinity. 1909. 54 p. 

 135 Miller, W. J. Geology of the Port Leyden Quadrangle. 1910. 



62 p. 



