ay 
A Last of Minerals and Organic Remains. 69 
are nearly transparent, almost cylindrical, with the excep- 
tion of a few, which belong to the bis-unitaire and tri-uni- 
taire of Haity. The same form is found at Franklin, New- 
Jersey.”* 
Glassy tremolite—York, U. C. In white, glassy, short 
and indistinct diverging fibres, dispersed among the peta- 
lite, minutely, and in large masses. © 
Petalite.—This rare mineral, not hitherto found on this 
continent, occurs on the north shore of Lake Ontario on the 
beach in front of York, the capital of Upper Canada, a 
few yards to the right of the wharf, used by the Steam- 
boat Frontenac. It is a rolled mass weighing about a ton, 
and has much glassy tremolite interspersed, and two large 
veins of irregular shape, of an aggregate of actynolite and 
calc. spar. Close to this bowlder lies a still larger of the 
ophicalcic familyt from Grenville or Gananoque, and strewn 
around are loose greenstones, sienites and some Labrador 
feldspar. 
The town of York is situated on clayey alluvion, con- 
taining in spots, many crystalline quartz nodules; the an- 
cient banks of the Lake are about a mile in the rear ; but at 
the distance of several miles east and west, they form its 
immediate shores in the slopes of the “ Burlington Heights” 
and the very picturesque cliffs of the “ York Highlands” 
three hundred feet high, and consisting of grey and blue 
clay, which now and then alternate with horizontal bands of 
ferruginous sand. 
At York the alluvion overlies a brown horizontal lime- 
stone, abounding in trilobites, orthoceratites, and other 
fossils of the older secondary formations, and abutting 
northwardly, forty miles from Lake Ontario, on gneiss and 
sienitic rocks. ) 
Anthophyllite.—Fort Wellington, U. C. In a large rol- 
led aggregate of crystallized quartz, calc. spar andapatite. A 
remarkably well characterized example, recognized by Dr. 
Hyde Wollaston, and Mr. Lowry of London. I had con- 
sidered it zoisite. 
* Dr. Troust, Journal of the Academy of Natural Science, of Philadel- 
phia, Vol. 3. p. 234. 
t A term used by the French Geologists to designate a rock composed of 
marble and serpentine. 
