—- 62 «J. Lawrence Smith on Emery. 4 | 
Notwithstanding the recent discovery of emerylite there is no 
other species of mica that can be considered so well established 
as this mineral, or so constant in its composition. Up to the 
present time this mineral has not been found except with emery 
or corundum, which frequently contain it in the interior of the . 
mass as well as on the surface. Some emerys contain it in such 
quantity that it has the aspect of gneiss, as I have already said 
with reference to certain specimens from Nicaria. 
The most beautiful specimens of emerylite come from Naxos ; 
and as the blocks of emery from this island frequently contain it, 
there will be no difficulty in procuring specimens for cabinets. 
It is often mixed with diaspore. 
ee eee 
lah. It is always in small plates on the surface of the emery. 
The analyses of four specimens are as follows :— 
Localities, | Silica. 2,0 Lime. is mene eo Se Water. | nese. 
Gumuch-dagh,....| 42:80 40°61! 3-01 | 1°30 | trace, ae 562 | trace. 
Mable AS. 43°62 | 38-10 aA 3:50 | 0-95 | 783 | BDL | trace. 
mon. 49-71 | 3752] 1-41 | 2°32 | trace. ape 5-95 | trace. 
Island of Nicaria, .| 42°60 | 37-45 | 0-68 1°10 | trace. 9°76 5:20 | trace. 
The composition is very nearly that of the muscovite or Mus- 
covy glass, and until farther examination, I shall retain it under 
that species, as particular care should be exercised in making new 
species among the micas £ 
Chloritoid, (a new variety of this mineral. )—It is found with 
the emery of Gumuch-dagh in considerable abundance. _ Its 
structure is lamellar, cleaving without much difficulty, and the 
surfaces exposed are always very brilliant. In thin fragments it 
transmits the light and appears of a dark green color. The 
powder is greenish grey. Its hardness is 6, and specific gravity 
3:52. Heated in the flame of the blowpipe it loses water, and 
becomes brown from the absorption of oxygen but does not 
melt. When heated without being in contact with the air it 
loses its brilliancy, and acquires the aspect of scales from the 
blacksmith’s forge. 
