of Schorlomite. 45 
tion highly characteristic of a certain class of silicates of 
alumina and soda or lime, of which scolezite and elæolite 
_are examples. A qualitative examination showed it to bea 
hydrous silicate of alumina and lime, with a little soda; in 
short, it has in every respect the character of a lime-mesotype, 
or scolezite, which mineral sometimes occurs massive; and as 
the amount of water it contains, as determined by Prof. Shep- 
ard, agrees pretty nearly with that in scolezite, I feel little 
hesitation in classing it with that mineral; at any rate, we 
may be safe in pronouncing it to be such, till it bas been 
proved by an accurate analysis, giving a new and probable 
formula, to be something new. 
It contains neither yttria nor thorina. 
III. SCHORLOMITE. 
This mineral is described by Prof. Shepard as occurring in 
hexagonal prisms with lateral edges truncated by narrow and 
brilliant planes. In the specimens which I have had an oppor- 
tunity of examining there are two distinct minerals. One is 
erysfallized in rhombic dodecahedra, of which the faces are 
small and distorted, except in one specimen, in which they 
are quite distinct. 
This mineral has the lustre, color, hardness and other char- 
acters of colophonite. It is of a deep clove-brown color, 
almost black, translucent on the edges. A qualitative exam- 
ination showed it to be composed of silica, oxide of iron and 
lime ; it is undoubtedly a lime-iron garnet or colophonite. 
Associated with this colophonite is another mineral, which 
is amorphous. Its hardness is 7.5; specific gravity 3.807 ; 
color black ; entirely opaque ; lustre vitreous ; tarnished with 
pavonine tints ; fracture highly conchoidal. 
This mineral I have, with the assistance of Mr. R. Crossley, 
carefully analyzed, and find it to be new, though it differs so 
much in external characters and in chemical composition 
from the mineral described by Prof. Shepard as schorlomite, 
that I have not considered myself justified in appropriating 
