CORUNDUM IN METAMORPHTC ROCKS. 55 
In a region of aai'netiferoiis mica-schist tapering prismatic crystals 
of grayish-blue corundum are found on the surface on the ridge lead- 
ing northwest from Carpenters Knob, along the borders of Burke and 
Cleveland counties, near the corner of CataAvba County, N. C. 
There are tAvo localities in South Carolina where corundum has 
been found more or less abundantly on the surface and in the gravels 
of the streams; one about 8 miles northwest of Gaffney, Cherokee 
County, on the Island Ford road, near Maud post-offi(;e on the Turner 
Phillips farm; and the other about 1^ miles northeast of the town of 
Laurens, Laurens County. At neither locality has the corundum been 
found in place, but crystals of corundum surrounded by scales of mica 
have been observed at both Gaffney and Laurens, and at the latter 
place fragments of what had all the appearance of a mica -schist 
were found that contained crystals of corundum. (See pp. 149-150.) 
Seven to 8 miles southwest of Thomaston, Union County, Ga., 
corundum has been found on the surface over a considerable area, 
and, although it has not been found in place, some specimens of 
corundum were found enveloped in a matrix of mica-schist. (See 
p. 143.) 
Genth " has described an occurrence of corundum in Patrick 
County, Va., about 2 miles from Stuart, where it has been found in 
the mica-schists on a knob of Bull Mountain. Here the mica-schists, 
sometimes garnetiferous and gneissic, are intersected by granite, 
Avhich separates the schist into narrow bands that can be followed 
for some distance across the country. The corundum is found asso- 
ciated with andalusite, cyanite, chloritoid, and mica. It occurs in 
rough crystals and nodules up to 1 inch in length and half an inch in 
diameter, of a grayish- white to white color and colorless. Some- 
times it is so finely divided that it appears as microscopic grains in- 
closed in the mass of associated minerals. It is readily cleaned, and 
tests made upon the cleaned product shoAv that it is well adapted for 
the manufacture of the vitrified wheel. 
xVt the Calumet iron mines in Chaffee County, Colo., corundum 
crystals have been found in the mica-schists at their contact with 
intrusive dikes of diorite. 
It is quite possible that some of the corundum schists of South 
Africa, described on page 158, may be highly corundifei'ous facies of 
mica -schists or quartz-schists, and hence comparable to some of the 
United States occurrences described above. 
CORUNDUM IN QUARTZ-SCHIST. 
It has recently been observed that portions or bands of the crystal- 
line rocks of the southeastern part of Clay County, N. C, and the 
"Am. Jour. Sci., 3d ser., vol. 39, 1890, p. 4. 
