ANALYSES OF ALLANITE 479 



per cent) recorded. A second noteworthy feature of the analysis is the 

 large quantity of didymia as compared with lanthana. 



Analyses of Virginia-North Carolina Allanite 



I II III IV V VI VII =« VIII 



SiOz 32.79 32.35 32.05 31.71 31.68 31.23 30.04 26.70 



TiOa 86 



AI2O3 18.16 16.42 22.93 9.32 17.33 16.45 16.10 6.34 



Fe^Oa 1.64 4.49 11.04 11.95 7.05 3.49 5.06 3.21 



Ce^Og 6.07 11.14 ) ( 13.90 ) 11.24 11.61 33.76 



T>UOs 14.40 6.91 t 14.81 -^ 9.07 U8.99" q qa / 5.39 16.34 



La^Oa 3.47 ) ( 1.25 ) ^''^ \ 4.11 1.03 



ErgOs none \ -, 19 f .52 



Y2O3 1.84 0.85 none r -"-^^l 1.65 



FeO 10.08 10.48 8.95 10.11 13.67 9.89 4.76 



BeO 24 



MnO 1.23 1.12 1.99 .18 1.03 trace trace 



CaO 10.95 11.47 9.43 11.02 10.79 8.69 13.02 2.80 



MgO 0.15 1.28 .96 0.54 .22 1.11 .54 



Na^O 0.33 \ 4^/ 0.54 \ ^^ ( 0.21 28 .49 



K2O 0.12 f '^^1 0.20 / •^'^ "f trace 02 .55 



H2O 1.89 2.31 3.64 .86 1.46 2.28 2.56 1.99 



99.65 100.62 98.76 100.19 100.31 99.06 99.36 99.03 

 Sp. gr 3.40 3.323 3.005 3.64 3.63 3.83 3.59 4.32 



I. Allanite from Balsam Gap, Buncombe County, North Carolina. F. A. 



Genth, Mineralogy of North Carolina, 1881, page 45. 

 II. Allanite from near Amelia Courthouse, Amelia County, Virginia. F. P. 



Dunnington, American Chemical Journal, volume 4, 1882, page 138. 



For a second and less complete analysis, see Koenig, Proceedings of 



the Academy of Philadelphia, 1882, page 103. 

 III. Allanite from hiddenite mine near Hiddenite, Alexander County, North 



Carolina. F. A. Genth, American Philosophical Society, volume 20, 



1882, page 402. 

 IV. Allanite from crest of Blue Ridge Mountains 9 miles south of Roanoke, 



Roanoke County, Virginia, within a few paces of the Franklin County 



line. fe. D. Gooch, analyst. 

 V. Allanite from near Bethany Church, Iredell County, North Carolina. 



H. F. Keller, American Philosophical Society, volume 24, 1887, page 42. 

 VI. Allanite from Little Friar Mountain, Amherst County, Virginia. J. A. 



Cabell, Chemical News, volume xxx, 1874, page 141. 

 VII. Allanite from near Lowesville, Nelson County, Virginia. C. G. Mem- 



minger, American Chemical Journal, volume 7, 1885-1886, page 177. 

 VIII. Allanite from Bedford County, Virginia. W. T. Page, Chemical News, 



volume 46, 1882, page 195. 



GULF STATES 



General observations. — Thus far Texas is the only one of the Gulf 

 States in which allanite is known to occur. 



Includes SnOj, .17 per cent. 

 Mostly 01303 ; 5 per cent Ce^Og. 



XXXVI— Bull. Geol. Soc, Am,, Vol. 28, 1916 



