pratt.] MODES OF OCCURRENCE. 15 
At all of the corundum localities examined a careful search has been 
made to find the corundum directly surrounded by the peridotite, but 
it has been thus observed at only one locality — the Egypt mine, on the 
western slope of the Sampson Mountains, in Yancey County, N. C. 
The few specimens obtained were collected by Mr. 1". S. Hayes, who 
developed the corundum property in that section. One specimen 
shows a prismatic crystal of the corundum surrounded by a granular 
peridotite (dunite), but with none of the chlorite minerals which 
usually intervene. The dunite is not quite fresh, but is stained a 
yellowish brown by iron oxide and is rather friable. On the basal 
surfaces of the corundum a little museovite is developed. This has 
been observed on corundum from other localities. 
Spinel has been found al a number of the corundum veins, and in 
„ 
10 
2 1 
^:^7^M&Ak"\^/" B'"'-V,'^ 
\ — ^ / . - — ---^ % '■*■ 11 ^ v ^ '- - — ^r- z ,'; - - ■' 
v',-;;BJ;: ?i»V'«'!!* r »*#^l' — ;-/ 
' '- ' ~ ^ v. ' J ** ' - 7 " S-^iSii' '-' % ,~ 
Fig. .'-• [deal cross section of a corundum -dunite vein at the Corundum Hill mine, Macon 
County, N. C. 1, hard and unaltered dunite; :.'. friable and discolored dunite; 3, talcose rock; 
4, enstatite; 5, green chlorite; 6, green chlorite, corundum, and spinel: i, green chlorite; 8, 
enstatite; 9, talcose rock: LO, friable and discolored dunite; 11, dunite. 
a few cases ii is very intimately associated with the corundum. Ai 
the Carter mine, near Democrat, Buncombe County, N. C, the corun- 
dum is found, in masses of a white and pink color, intergrown with 
a greenish- black spinel. The masses of corundum and spinel are 
partially surrounded by a deep-green chlorite, which has also been 
developed in places between the corundum and the spinel, although 
this contact of the corundum and the spinel is usually Very sharp and 
distinct. A massive, coarsely to finely granular spinel is found at the 
Corundum Hill mine, Macon County, N. C, which has dissemi- 
nated through it small grains and fragments of pink and white 
corundum. 
The mineral chromite, which has always been found associated with 
these peridotite rocks, occurs sparingly in many of the corundum 
veins. It is a well-observed fact 1 that where there is any quantity of 
Am. Inst. Min. Eng., Vol. XXIX, 1899; February meeting. 
