Minerals from Plymouth and New S. Shetland. 161 
V. Notice of Minerals from Plymouth, Conn—Profes« 
sor SILLIMAN,—Sir,—The parcel of minerals from Plym- 
outh, Cen. discovered by Messrs. Erastus Smith and Silas B. 
Terry, and forwarded to you for examination, in compliance 
with your request I have examined :—the following are among 
the more interesting of them. 
n ore of titanium, which at first view appeared to be 
- specular iron. Its colour is iron black, passing into steel 
gray, and its structure is lamellar. One specimen, howev- 
er, presented me with a fragment of a large crystal, exhibit- 
ing sections of a rhombic prism, of 110° and 70°, having its 
obtuse and lateral edges replaced by planes, which formed, 
with the primary lateral planes, angles of 125°. The cross- 
fracture of this mineral varies, from uneven to flat conchoid- 
al: its lustre is glistening, and sometimes brilliant. It is o- 
paque, brittle, and hard enough to scratch glass; is not mag- 
netic, either before or after having been submitted to the ac- 
tion of the blowpipe, and is infusible without addition, but 
with borax fuses into a reddish transparent glass. Its spe- 
cific gravity is 4.5. It occurs imbedded in granite, in vari- 
quarter of a pound. hus it appears to approach in its cha- 
es. 
2. Phosphate of Lime in foliated masses, of a pale green- 
ish color, and imbedded in massive Cyanite. 
3. Stilbite in laminze, which are disposed in a radiatin 
manner. It is of a grayish whjte color, translucent, and - 
by glass. While undergoing fusion, it emits a phosphoric 
light, as is the case with all Stilbites, whieh I find to possess 
this character in a more eminent degree than the Heulandite. 
' 4, Zoisite, both gray and blue, _and closely resembling 
specimens of this mineral found at Williamsburgh and Ches- 
terfield, Mass. Yours, very respectfully, ae 
: Cuas. U. SHEPARD. 
New-Haven, Dec. 13th, 1826. 
VI. Minerals from New South Shetland.—A small box 
of speciation. cstee brought from New South Shetland, 
contained the following substances, which (from the situation 
VOL. XII. No. I 21 
