l62 NEW YORK STATE ]MUSEUM 



Zircon occurs in the coarse pegmatite sent up in large quantities 

 from the '' 21 " workings about 13 years ago, and now only avail- 

 able in a few large lumps on one of the dumps. The crystals are 

 of great perfection although of simple forms, no, 331 and in 

 make up the combination. When fresh they are a dark mahogany 

 brown, but some sort of alteration has changed the outer portions 

 of many crystals to an earthy, green and very tender material. 

 The crystals vary in size up to an inch long and three eighths 

 thick. Around them in the matrix are the usual radiating strain 

 cracks. In the hornblendic masses from the dumps on Barton 

 hill, one may rarely obtain small but brilliant zircons consisting 

 of the prisms of the two orders, capped by the zirconoid and the 

 unit pyramid. Figures of each of these are given on page 161 

 which were kindly drawn by Prof. C. H. Smyth. 



BIBLIOGRAPHY 



The following list of papers relates especially to the area covered by the 

 bulletin. 



A short bibliography of the eastern Adirondacks will be found in Kemp's 

 Prcliirtinary Report on Essex County^ cited below, and in Van Rise's 

 BuUctin 86, also cited below. A review of the literature up to 1892 is given 

 by the former in the Transactions of the A\^zv York Academy of Sciences, 

 volume 12, page 19, 1892. 



Anon. Vacation Notes from Northern New York. On Port Henry. 

 Eng. and Min. Jour. Aug. 31, 1889. p. 186. 



The Mineville JMagnetic Alines. The Iron Age, Dec. 17, 1903. 



Port Henry Mines and Furnaces. The American Raih-oad Journal, 1849. 



Beck, L. C. Report on the Mineralogy of New York State. Albany 

 1842. p. 14-16. 



Gives some details of the Cheever and Sanford Mines. 



Bell_, Sir Lowthian. Notes of a visit to Coal and Iron Mines and Iron- 

 works in the United States, 



Read before British Iron and Steel Institute, 1875. Separate reprint, p. 21. Describes 

 his visit to Mineville. Compare also " The Iron and Steel Institute in America," Special 

 Volume of Proceedings, 1890, p. 76. 



Birkinbine, John. Crystalline Magnetite in the Port Henry, N. Y. 



Mines. Am. Inst. Min. Eng. Trans. 1890. 18:747. 



Good account of the Lover's pit, with notes, statistics and an lyses of tKe ores. 



Blake, W. P. Lanthanite and Allanite in Essex County, N. Y. 

 Am. Jour. Sci. Sept. 1858. p. 245. 



Mentions Blood Red Mica from Moriah. Idem. iSsi. p. ii, xii. 



Contribution to the Early History of the Industry of Phosphate of 



Lime in the United States. Am. Inst. Min. Eng. Trans. 1892. 21 :i57. 



Describes earls'- attempts to utilize the apatite of the Sanford vein. 



Association of Apatite with Beds of Magnetite. Idem. 1892. 21:159. 



Advocates stratified and organic origin of apatite and magnetite. 



