phatt.] CORUNDUM LOCALITIES. 79 
The late Mr. Alfred E. Hunt, of Pittsburg, Pa., made the following 
statement : 1 
The real difficulty which we find in the use of corundum for this manufacture 
is the cost of the raw material as compared with that of native bauxites. In this 
item we include not only the price of the corundum as it has been offered to us, 
but also the expense of grinding it to an impalpable powder, which must be done 
before it can be used directly in the manufacture of aluminum, and the cost of 
preliminary chemical treatment for purification — which latter operation, however, 
is also required for bauxite. 
Corundum has also been used as the source of the aluminum in the 
manufacture of aluminum-copper and aluminum-iron alloys, In the 
manufacture of these the corundum, withoul undergoing any previous 
treatment, was charged into an electric furnace with a mixture of 
carbon and copper or carbon and iron, according to whether aluminum 
oronze or ferro-aluminum was desired. Since L890, however, when 
alumina began to be manufactured at a comparatively Low price, this 
artificial oxide has been used in the place of the corundum. 
CORUNDUM LOCALITIES IN THE UNITED STATES. 
Under this head are included practically all the Localities in the 
United States at which corundum lias been found, and if they have 
been described under the heading "Distribution of corundum " t hey 
are simply mentioned here. Regarding the other localities, the mode 
of occurrence is given in most cases, and also sonic idea of the extent 
and character of the corundum. 
This list is probably not complete, but it represents all those local- 
ities that T have visited and those of which an authenticated record 
could be obtained. It is taken up alphabetically by Slates. 
ALABAMA. 
Dudleyville. — Between this town and Perry .Mills, Tallapoosa 
County, corundum has been picked up at a number of places in the 
soil, but none has been found in place. Peridotite rocks have been 
found in the vicinity, and it is not at all improbable 1 hai the corundum 
was derived from these rocks. 
Hanover. — Corundum has been found sparingly in Coosa County 
in the vicinity of this town. 
CALIFORNIA. 
Plumas County. — An interesting occurrence of corundum has 
recently been observed in the vicinity of Meadow Valley. Cutting 
the serpentine rocks of the eastern slope of Spanish Peak at an eleva- 
tion of about 4,100 feet, and 1| miles west-northwest of the Meadow 
Valley post-office, is a series of white coarse-grained dikes that are 
1 Trans. Am. Ins. Min. Eng., Vol. XXVIII, 1898, p. 875. 
2 Geol. Survey Alabama, Report, 1875, p. 85. 
