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different colors and shades were illustrated by an original 
colored plate. 
February 20th, 1871. 
Pror. T. EGLESTON, Vice President, inthe chair. Fourteen 
persons present. 
Dr. L. FEUCHTWANGER exhibited a Hemitrope Crystal of 
Spinel, from Amity, New York. At this locality, and reach- 
ing from Amity, in New York, to Andover, in New Jersey, 
Dana says, a distance of thirty miles, is a region of granular 
limestone and Serpentine, in which localities of Spinel 
abound. At Amity, crystals sixteen inches in diameter have 
been found, and one has been procured there weighing forty- 
nine pounds. Tale and Magnetite are also associated with 
the Spinels at this point. He also made some remarks upon 
a collection of Tourmalines of various colors, one of a fine 
red tint, and others of a beautiful yellow, which had been 
brought from the vicinity of Bangor, Maine. 
Hon. EK. G. SQuIER presented some specimens of Oche, from 
Central America, and made some remarks on their mode ot 
occurrence. 
/ 
Pror. T. Eauxston exhibited a large collection of cut, 
colored Diamonds, loaned by -G. Tiffany & Co. for the purpose. 
The stones were thirty in number, several of them weighing 
2 and 8 carats each. The colors shown were four shades of 
honey yellow, four shades of yellowish green, three shades 
of light green, rose, garnet, brown, white and opalescent. 
There were three shades of dark colored, nearly black. A 
blue stone in the collection is doubtful, probably sapphire, 
though blue diamonds are known. Prof: EH. is endeavoring 
to have a collection of eighteen stones, showing all the colors, 
presented to the School of Mines. 
