Bb8 Lopaz. 
It ought net to be forgotten, that in Hurope, the topaz is: 
irequently associated with tin. Perhaps this important metal 
is yet to be added to the numeruus etes found in Huntington, 
since the geological features of this region are those with 
which fin is usually found, and most of the minerals which 
accompany this metal in its known localities, exist here in 
very considerable abundance; such as arsenical iron, the 
ores of tungsten, quartz, topaz, hornblende, mica, and the 
fluate of lime. 
4, Geological Situation.* 
- 
We have not visited the locality of this mineral, but it occurs 
in a magnificent vein of fluor spar, consisting principally of that 
variety called the chlorophane. Itisin Monroe, next to the town 
of Huntington, 20 miles west of New Haven; the vein of fluor 
spar traverses granular limestone in gneiss. Of this vein you 
have given a description in the second Vol. of the American 
Journal of Science, page 142. Some specimens in our pos- 
session exhibit the fluor spar on one side, and this mineral on 
the other. Quartz, and a fibrous, talcose mineral, which we 
have not thoroughly examined, are also intimately associated 
swith it. 
Very respectfully, your obedient servants, 
EDWARD HITCHCOCK, 
Professor of Chemistry, &c. in Amherst College, Mass. 
BENJAMIN D. SILLIMAN, 
Assistant in the Chemical and Mineralogical department of Yale College. 
a ens 
ad 
*® The notice of the vein referred to by the writers of the above article 
was drawn up several years ago from facts stated verbally by Mr. Lane. 
Thave since visited the place, and find his description correct. The veins 
of fluorspar are equalled for magnitude only by those of Derbyshire,in Eng- 
land, which I formerly explored and can therefore from personal know~ 
ledge compare them. When they shall be opened and wrought, it is prob- 
able that the massive fluor fitted for ornamental work to be turned on 
the lathe, will be obtained, and perhaps vases of American fluor may be 
fabricated. However this may be, every thing on the surface, an- 
nounces that interesting minerals will be obtained beneath; we already 
find bery! and topaz, among the imbedded minerals of this vein, and the 
whole appearance of this region indicates a great mineral and prob- 
ably metallic deposit. The locality of the fluor is four miles south of 
at is usually called Lane’s mine, but it belongs to the same formatien in 
eyery sense, both mineralogical and geological._—Hnrror.- 
