J. Lawrence Smith on Emery. ae 
This corresponds to the following formula, Si Al-+21, but it is a 
question whether or not we should consider the water as existing 
in any definite proportion, and whether or not they did not all 
contain more water when first taken from their localities. ‘These 
hydrated silicates of alumina are numerous, and bear various 
names, but it is doubtful if many of them are entitled to much 
consideration as distinct species. 
Ephesite, (a new species.)—This silicate is found with the 
emery of Gumuch-dagh and occurs on specimens of magnetic 
oxyd of iron. It is of a pearly white color, and lamellar in struc- 
ture; cleavage difficult. It scratches glass easily, and has a sp. 
grav. of from 3:15 to 3-20. Heated before the blowpipe it be- 
comes milk-white, but does not fuse. At first sight it might be 
taken for white disthene. It is decomposed with great difficulty 
soda. I used also very successfully in the analysis the bisulphate 
of soda either in attacking the mineral from the commencement, 
or in operating first with carbonate of soda, and then acting on 
the part not decomposed with bisulphate of soda. The alkalies 
Were separated by means of hydrofluoric acid. 
Silica, 3154 — 
Alumina, 57°89 ‘ 6s 
Lime, 189 ies 
Protoxyd of iron, 134 wie. 
Soda with a little potash, - pp 
ater, 3°12 Be 
This corresponds very nearly to the formula 
R2 Sitsdr Si+4 
Atoms. At. weight. Pr; ct. Oxygen ratio, 
Soda, oe . tSis 7-08 i 
Silica, 6 3400-2 30:77 9 
Alumina, 10 6416-2 58-08 15 
ater, - A A50 4-07 2 
This mineral has been designated E’phesite because of its oce 
currence at the emery locality near the ancient city of Ephesus. 
* See this Journal, 2nd ser., vii, 285, 1849. 
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