ZIRCONIFEROUS SANDSTONE NEAR ASHLAND, VIRGINIA 289 



litic conditions for its formation. That much zircon accompanies riebeck- 

 ite is indicated in the worlc of Brogger, Washington, Mrazec, Lacroix, 

 Sousa Brandao, and Murgoci. 



Zircon is reported from pegmatite in Auburn and Norway, and from 

 Mount Mica, in Paris, Maine.* In the to\\'n of Norway near Cobble Hill 

 perfect crystals of zircon, chrysoberyl, and zinc spinel occur in the pegma- 

 tite. The zircon crystals one-sixteenth to one-eighth inch long lie upon 

 slicken-sided surfaces, and Bastin says they "were probably formed during 

 the shearing process" (p. 79). Zircons, associated mostly with triphyUite 

 and rarely exceeding one-eighth inch in diameter, are reported in the peg- 

 matite of Mount Mica, Paris, Maine (p. 88). 



Kempt described zircons of two varieties from the coarse pegmatites 

 near Port Henry, New York, some of which were exceptionally fine crys- 

 tals of dark bro'mi color, and measured up to an inch in length. Bastin| 

 reports very perfect crystals of zircon about half an inch in length as 

 abundant in $. few places in typical granite pegmatite near Crown Point 

 in Essex County, New York. 



Zircon is a constituent of the pegmatites which cut the schists of the 

 New Jersey highlands and are mineralogically like them.§ Bayley refers 

 to zircon, magnetite, fluorite, etc., of the pegmatites as deposited from 

 vapors (p. 152.) 



In the well known pegmatites of Ameha County, Virginia, zircon^ 

 has been noted in small crystals and in masses weighing several pounds, 

 associated with a score or more of other rare and heavy minerals. Near 

 Gouldin post-office, Hanover County, pieces of zircon crystals three inches 

 in diameter which have weathered out of rutile-ilmenite-bearing pegmatite 

 dikes have been found on the surface. 



Pratt° and Sterrett® report zircon as one of the minerals found in the 



* Bastin, E. S., Geology of the Pegmatites and Associated Rocks of Maine, 

 Bull. 445, U. S. Geol: Survey, 1911, pp. 18, 53, 78-79, and 88; Kunz, G. F., On the Tour- 

 malines and Associated Minerals of Auburn, Me., Amer. Jour. Sci., 1884, vol. 27, pp. 

 303-305. 



t Kemp, J. F., Trans. Amer. Inst. Mm. Engrs., 1898, vol. 27, p. 200. 



J Bastin, E. S., Economic Geology of the Feldspar Deposits of the United States, 

 Bull. 420, U. S. Geol. Survey, 1910, p. 55. 



§ Bayley, W. S., N. J. Geol. Survey, 1910, vol. vii, p. 125. 



1 Watson, Thomas L., Mineral Resources of Virginia, 1907, p. -282. 



° Pratt, J. H., Mining Industry in North Carolina in 1901, Economic Paper No. 6, 

 N. C. Geol. Survey, 1902, pp. 40-42. 



° Sterrett, D. B., Mica Deposits of Western North Carolina, Bull. 315, U. S. 

 Geol. Survey, 1906, p. 407. 



