Igneous 
62 CORUNDUM^ ITS OCCURRENCE AND DISTRIBUTION. 
near Friendship, in Guilford County; it has been found asso- 
ciated with staurolite on Mine Fork of Jacks Creek, 3 miles north of 
Burnsville, in Yancey County ; and extensive deposits have also been 
observed 5 to 7 miles southeast of Franklin, in Macon County. 
FOREIGN OCCURRENCES OF CORUNDUM.* 
A number of foreign occurrences of corundum, especially those that 
are of economic importance, have already been referred to in connec- 
tion with descriptions of similar occurrences in this country. There 
are, however, several other modes of occurrence of corundum of 
scientific interest that have been observed in foreign localities, but 
have not yet been found in the United States. These are briefly men- 
tioned below in order to make the list of known corundum-bearing 
rocks as nearly compkte as possible : 
Coriindiim-hearing rocks not found in the United States. 
Kyschtymite. 
Diorite. 
Tonalite. 
Gabbro. 
Nepheline-syenite. 
Syenite-pegmatite. 
Quartz-porphyry. 
Trachyte. 
Basalt. 
Contact zones and inchisions in igneous rocks. 
Metamorphic fCorundum-schists and porphyroids. 
iGraphite. 
CORUNDUM IN FOREIGN IGNEOUS ROCKS. 
CORUNDUM IN KYSCHTYMITE. 
Morozewicz has differentiated Avhat he considers a new type of 
rock and has given it the name kyschtymite, after the Kyschtym 
district of the Urals.^ The rock is medium grained and is composed 
of idiomorphic corundum of a pyramidal habit, anorthite, and 
biotite, with accessory dark-green spinel, apatite, and zircon. 
CORUNDUM IN DIORITE. 
Teller and von John ^ found corundiun associated with touruuiline, 
spinel, ilmenite, rutile, biotite, and occasionally zircon, in the bor- 
ders of the quartz-mica-diorites that penetrate the gneisses and 
" This part of this paper was especially prepared by Prof. J. V. Lewis and the writer for 
Bull. No. 19, Geol. Survey North Carolina. 
" Tschermaks mineral, ii. petr. Mittheil., vol. 18, pts. 1, 2, 3, 1898, and review of same 
in Jour. Geol., vol. 7. 1899, p. 304. 
'^ Jahrbuch K.-k. geol. Reichsanstalt, vol. 32, 1882, pp. 589-684. 
