350 On Rutile and Chiorite in Quartz. 
Art. XXXII.—On Rutile and Chlorite in Quartz; by O. P. 
Husearp, M.D., Prof. Chem., Min. and Geol., Dart. Coll., N. H. 
From the Lepeondinae of the fea es egeperg for the Advancement of Science, 
New Haven, 1850. 
Spiess of rutile in quartz have for twenty years past, been 
found.in boulders in several towns in the vicinity of Dartmouth 
College, none of which ee ever been traced to their sources. 
Localities. have been mentioned, but none have furnished spe- 
 cimens resembling these boulders, excepting a single one. This 
-. Central Railroad. It was described by Mr. Alger in the Proceed- 
ings of the American Association for 1849, and also in.the pres- 
ent volume of this Journal, page 
~~. Ina cut of sixty feet perpendicular through solid talcose slate, 
and thirty feet from the surface, a vein or pocket of quartz 
‘was met, and a considerable number of specimens soniaumaae 
rutile were obtained. The locality is now exhausted. F 
its position, it never could have furnished the scattered ‘cialis 
heretofore known, and we have yet to discover their origin. .” 
Some of the specimens from this region have comparatively. 
but little beauty; the rutile is in very fine capillary crystals of 
dark color, two or three inches in length, and the quartz is of 
stele quality. But others are exceedingly fine, both in the rich- 
ss of the quartz and the abundant long needJes of the rutile. 
“There are three known American specimeng of a remarkable 
character, one of which is from this Waterbury locality. The other 
two were found as boulders and are even of superior quality. 
One of these has been in the Cabinet of Dr. J..R. Chilton, 
New York City, for many years, and is réported to have been 
found in Northern New England. It has the rutile in long acicu- 
lar crystals and one series of prisms united into a crystal a kcal 
-. fer of an inch wide. 
. The other is a mass in the writer’s cabinet, described. by Mr. 
_ Alger as “the finest specimen of this mineral found in the Uni- 
ted States.” _ It was picked up in this region nearly twenty years 
ago, but in what town is not known. Specimens _— Roches- 
ter and Bethel, Vt,, resemble it more than any other 
It is about six inches long and three inches in its otha dimen- 
sions, being of irregular shape, and only a fragment of a larger 
mass. ‘T'wo sides have been cut ons polished by the lapidary, 
one retains its polished plane boulder surface, and the remaining 
e exterior is irregular, presenting a conchoidal fractured 
surface. There are indications of smooth cleavage faces in 
ferent ea inclined to each other. 
uartz in mass is transparent and slightly smoky—while 
the slices cut off r are almost colorless. It is questionable w whether 
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