COKUNDUM IN UNITED STATES. 143 
foil IK I associated with peridotite rocks. Some little prospecting has 
ixHMi done here within the formation and some near the contact. 
Pine Mountain^ Rabun County. — In peridotite. (See p. 128.) 
Porter Springs. — One mile southeast of this place (in Lumpkin 
County) corundum has been found in an amphibolite, but not in 
piantity. 
Powder Springs, — There is a considerable outcrop of peridotite in 
Cobb County, in the vicinity of Powder Springs, Avliich otl'ers a prom- 
ising place for prospecting. A small vein has been opened on the 
W. B. Turner farm. 
Rabun Gap. — Several pounds of corundum have been obtained 
from the Beavett mine; it occurs in a peridotite rock. 
Teltonville. — One mile north of this town, in Forsyth County, sur- 
face specimens of corundum have been found which evidently origi- 
nated in the quartz-schists of this region. 
Stone mhie. — This nunc, which is in the same general formation as 
[he Track Rock mine (see p. 130), is in Rabun County. Only a little 
[levelopment has been undertaken, and the prospect that the deposit 
may be valuable is not very favorable. 
71io)iiaston. — Seven to 8 miles southwest of Thomaston, Upson 
Oounty, considerable corundum has been found on the surface at the 
)ld Kelly farm. Some of the specimens of the corundum in the 
natrix indicate that it was derived from a mica-schist. The crystals 
ire all flat and tabular, with basal plane very prondnently developed, 
Hid they vary in thickness from an eighth to half an inch. They are 
usually bounded by the prism and the l)ase with occasionally the unit 
L'hombohedron. The basal plane is often pitted or etched with tri- 
ingular indentations similar to those described as occurring on the 
North C^arolina rubies (p. 108) and the Montana sapphires (p. 109). 
Track Rock mirw. — In peridotite. (See p. 130.) 
West Point. — A short distance northeast of this toAvn (in Trouj^ 
Hounty) corundum, has been found sparingly in a narrow strip of 
peridotite. Apparently no large (juantity is present. 
IDAHO. 
Oriflno Creek. — (See p. 116.) 
Pierce City. — Fragments and crystals of corundum have been found 
n the gravel deposits in the vicinity of Pierce City. (See p. 116.) 
Rhodes Creek. — (See p. 116.) 
MAINE. 
Corundum has been found sparingly at Greenwood, Me.,^ occurring 
in crystals in mica-schist and associated with beryl, zircon, and 
lepidolite. 
« Dana's Mineralogy, 6th ed., 1902, p. 213. 
