84 J. L. Smith on the E'mery mine of Chester, Mass. 
especially diaspore and emerylite; this last mineral forms, by 
the identity of its composition in the different formations that 
the author had occasion to study, a mica constituting a new 
species, and one well determined ;” 
3d, “Finally, that he has given a means for determining the 
qualities of emery, and consequently their commercial value; 
this process, eminently practical, offers, besides, an interest in a 
scientific point of view, inasmuch as it permits of ——s 
the difference in the tenacity of minerals of equal ha 
“These researches of geology, mineralogy, and of snalytcl 
chemistry, constitute a work of the highest interest, both as 
whole, as well as from the new facts they promise to soiniadl 
Your committee consequently propose to thank Dr. Smith for 
having peictcamiegted them to the Academy, and in considera- 
At that time I had discovered six new localities of emery in 
Asia Minor, and the Grecian Archipelago. Those localities were 
far removed from each other, and furnished so many different 
places for the study of emery and its associate minerals in addi- 
tion to the old locality of Naxos; and consequently many.points 
of general interest were brought out, besides others connected 
with the line of study. Those who may feel interested in the 
subject will find the investigation and results there arrived at in 
this Journal, vols. x and xi, 1850 and 1851; they embrace the 
geology, mineralogy, ¢ chemical ¢ composition, manner of mining, 
commercial Se aga associate minerals, &c. 
The study of the associate minerals I considered of great 
importance, as they pial be guides in future explorations in 
ilies parts. of the world; and even prior to completing the re- 
searches on the subject I wrote to Professor Silliman and 
him to examine the American corundum localities for these 
minerals, one of them in particular, which he immediately did. 
With the corundum from the locality in Chester county, Penn., 
and Buncombe county, N. C., he “soon found the mineral indi- 
cated,” and communicated the same to this J ournal, Nov. 1849, 
pp. 879 and 383. 
Nothing further came to my notice in relation to emery until 
I received from Prof. ©. T. Jackson a letter dated Oct. 9th, 1864, 
—— what foll 
¢e 
iscovered pacer or margarite in Asia Minor as an 
associa ba mineral with emery. On the 22d of October last, 1863, 
