218 The American Geologist. October, 1893 
NEW OCCURRENCES OF PARALLEL INTER- 
GROWTHS OF THE MINERALS ALLAN- 
ITE AND EPIDOTE. 
By Wm. H. Hobus, Madison, Wis. 
In April, INNS, I made mention of the observations of paral- 
lel intergrowths of allanite and epidote in the porphyritic gran- 
ite of the vicinity of Ilchester, Maryland.* Dr. G. H, Williamsf 
subsequently found them to have a wide distribution in the 
granites of the vicinity. Professor A.'LacroixJ of Paris has 
since described similar parallel growths of these minerals in 
the pyroxene amphibole gneiss of Finisterre, France, and in 
the pyroxene wernerite gneiss of the nieder-osterreichischen 
Waldviertel and the wernerite gneiss of Oedegaarden in Nor- 
way. Professor W. ('. Brfigger§ has also mentioned very 
similar growths from the pegmatite dikes of Arendal, in Nor- 
way, with three distinct zones. The two inner ones are 
doubtless allanite possessing zonal structure, and the outer 
one epidote. Professor Brogger thinks that this epidote is at 
least in some cases not original, but of pseudomorphic origin. 
Another description of allanite-epidote intergrowths is by 
Dr. Frank D. Adams | and is from a granite from Wrangell 
island, Alaska. 
Mr. R. B. Green of Ishpeming, Mich., lately a student in 
geology at the University of Wisconsin, while making a mi- 
croscopical examination of a suite of rocks collected by pro- 
fessor Van Hise came upon intergrowths of these minerals in a 
granite from the vicinity of Needleton, Colorado. Dr. Van 
Hise has called my attention to a rock from the Medicine 
Bow range in southern Wyoming in which he has found the 
same intergrowths. Within the last two years I have found 
allanite-epidote growths at a number of localities in the gneiss 
of southern Berkshire county, Massachusetts, and particularly 
on Warner mountain in Sheffield. It is probable that other 
*Johns Hopkins University Circulars, No. 65, April, 1888. (See also 
Tsehermak's mineral, u. petrograph. Mittheilungen, xi, p. 1; also Am. 
Journ. Sci., vol. xxxviii, pp. 223-228, Sept., 1889.) 
tGuide to Baltimore, with an Account of the Geology of its Environs. 
Baltimore, 1892. 
JBull. de la societe franc, de mineralogie, xii, No. 4, 1889. 
ijZsitschrift fur Krystallographie, xvi, p. 99, 1890. 
Canadian Record of Science, 1891, p. 344. 
