DISTKIBUTION OF ALLANITE 467 



uted in the rocks of the Philipsburg quadrangle, Montana, both as a 

 pyrogenic and as a metamorphic mineral. It is an accessory in almost 

 all the granular and porphyritic intrusives, and is very abundant in places 

 in the marginal facies of some of the granitic batholiths at their contacts 

 with sediments. It occurs partly in parallel intergrowths with pistacite, 

 which always surrounds it, and the allanite is considered as probably 

 primary. 



Distribution of Allanite in the eastern United States 

 new england 



General observations. — Allanite occurs in each of the New England 

 States. It is quite widely distributed as a minor accessory mineral in 

 the more acid igneous rocks, such as granite, as a constituent of pegma- 

 tites in several States, and as a contact metamorphic mineral in Pelham, 

 Massachusetts. The mineral has been found at several localities in a 

 partially decomposed or weathered state. The principal occurrences are 

 briefly reviewed below by States. 



Maine. — Although pegmatites of granitic composition in which feld- 

 spar quarries have been opened are fairly abundant over parts of south- 

 central and southwestern Maine, allanite has been reported from only 

 three localities. These are Mount Apatite, in the northern part of the 

 town of Auburn, Androscoggin County ; the town of Topsham, Sagadahoc 

 County, and about Brunswick, where, according to Merrill,^^ "the variety 

 orthite occurs in forms closely simulating rusty nails in the granitic rock 

 about Brunswick." 



The pegmatites at Mount Apatite are worked for feldspar, and to some 

 extent for minerals as gems or as cabinet specimens. In addition to the 

 rock; minerals, feldspar (orthoclase, microcline, and albite var. cleve- 

 landite), mica (muscovite, biotite, and lepidolite), and quartz, the other 

 minerals reported are garnet, leucopyrite, tourmaline, beryl, apatite, 

 allanite, amblygonite, autunite, cassiterite, columbite, cookeite, damourite, 

 gummite, magnetite, molybdenite, triplite, and zircon.^^ 



The list of reported minerals in the pegmatites of the town of Topsham 

 is much smaller than for Mount Apatite. In addition to the rock min- 



1^ G. r. Merrill : The Nonmetallic Minerals, John Wiley & Sons, New York, 1904, p. 

 201. 



12 G. F. Kunz : Am. Jour. Sci., 3d ser., vol. 27, 1884, pp. 303-305. 

 F. W. Clarke : Bull. 42, U. S. Geol. Survey, 1887, pp. 15-17. 

 S. L. Penfield : Am. Jour. Sci., 3d ser., vol. 47, 1894, p. 336. 



J. E. Wolff and C. Palache : Proc Am. Acad. Arts and Sci., vol. 37, 1902, p. 515. 

 W. R. Wade : Eng. and Min. Jour., vol. 87, 1909, pp. 1127-1129, 



E. S. Bastin: Bull. 420, U. S. Geol. Survey, 1910, pp. 23-26; Bull. 45, Ibid., 1911, 

 pp. 49-59. 



