68 CORUNDUM, ITS OCCURRENCE AND DISTRIBUTION. 
North Carolina or Georgia ; but, on the other hand, clinochlore is the 
common chlorite found associated with corundum in these States. 
Then, again, zoisite is a very common associated mineral at some of 
the localities in North Carolina and Georgia, while epidote is almost 
entirely Avanting. Of the feldspars, albite and oligoclase are the 
more abundant associates in North Carolina and Georgia, while 
anorthite is more connnonly associated \\i{\\ the corundum in other 
localities. Another noticeable difference is in the mineral diaspore, 
the hydrous oxide of aluminum, which is very commonly associated 
with the corundum in Asia Minor and at Chester, Mass., but Avhicli 
tip to the present time has been identified at but one locality in 
North Carolina, and then there Avas but one s})ecimen reported. It 
may be, however, that the diaspore is formed in mimite quantity as 
a direct hydration of corundum. This Avould accoimt for the Avater 
that is shoAvn in many analyses of corundum and Avould also explain 
the comparatiA^e softness of some specimens of corundum. 
Another A^ery commonly associated mineral of corundum and 
emery is margarite, Avhicli occurs perhaps as universally as any of the 
directly associated minerals. It occurs very abundantly Avith the 
emery at Chester, Mass., Avith the corundum at many localities in 
North Carolina and Georgia, and Avith the corundum in California, 
and it is in some cases due to the direct alteration of corundum. 
The carbonates are extremely rare associated minerals of corun- 
dum, except when corundum occurs in limestone. In the peridotite 
and pyroxenite rocks there are tracers of magnesium carbonate 
observed, dcA^eloped in the cracks of the rocks, and at a fcAv localities 
crystals of aragonite liaA^e been found. 
Phosphates are sometimes observed in the zone of alteration 
products, and in a number of localities, as at Corundum Hill, Macon 
County, N. C, and the Bad Creek mine. Sapphire, N. C, crystals of 
apatite Avere found that measure nearly 1^ inches in length and half 
an inch in diameter. 
Some of the minerals knoAvn to occur Avith corundum have been 
found only at one locality, such as Avellsite, a neAV mineral described 
from the Buck Creek mine. Clay County, N. C., and a number of the 
A^ermiculites, as lucasite, kerrite, Avillcoxite, etc. 
There is given in the folloAving table an alphabetical list of the 
minerals that have been found associated Avith corundum at the A^ari- 
ous localities in the United States. As far as possible it is indicated 
Avhether the minerals are primary associated minerals, rock constitu- 
ents, or alteration products. It has also been indicated Avhether the 
mineral has been found at only one locality. 
