2 A List of Minerals and Organic Remains. 
talline forms existed in this specimen, they were destroy- 
ed in detaching the mass. Nothing now remains buta 
fragmented crystalline purple mass. The specimen was giv- 
en to me in 1819 by Lieut. Skene, superintending engineer of 
Quebec. My friend Dr. McEwen of Philadelphia, has 
also met with fluor in this locality. 
It is present in the secondary limestone of Montreal, fil- 
ling fissures in the calcareo-quartzose veins common at the 
foot of the mountain. It is purple and massive. 
It is plentiful in the sienite of the north mainland of Lake 
Superior, opposite Peck Island, and likewise six miles east 
of the Written Rocks, filling ec heh is purple, translu- 
cent, crystalline, and separated fromthe sides of the cleft by 
a film of white calc. spar —in amygdaloidal trap, oncale. spar, 
three miles east of Point Gargantua—purple and green— 
(Major Delafield.) It is abundant, lining fissures, together 
with sulphate of Barytes, in the porphyry of the large and 
lofty island, three miles east of Gravelly Point, and sixty 
three miles east from Fort William. It is here green, and 
highly translucent—a specimen from this locality present- 
ed to me by Lieut. Bayfield, Royal Navy, (employed by 
the British Government in a naval survey of Lake Superi- 
or,) possesses a numerous groupe of well defined octohe- 
dral crystals, the largest of which are one quarter of an 
inch in diameter. This porphyry isa partof that before allu- 
ded to, as in intimate connexion with amygdaloid and red 
sandstone. 
Barytes.__Large tabular oe of this mineral ac- 
company the green fluor of the porphyry of Lake Superi- 
or. Itappears to be the gray, straight, lamellar sulphate. 
Strontian.—F oliated sulphate of strontian exists in roun- 
ded imbedded masses, from one to six miles in diameter, in 
horizontal azoophitic limestone, (resting occasionally direct- 
ly on gneiss,) two miles N. EK. froin Kingston, on the shore 
of Lake Ontario. It is white, faintly translucent, and is in 
large crystalline facets—never (as fas as 1am aware) in 
prismatic forms. It is plentiful. 
It occurs in a very similar limestone on the right bank of 
the Ottawa, near the headof the Long Sault, sixty miles 
from Montreal; but here it is in. small oblique four sided 
prisms, superimposed on white calc. spar, sky blue, trans- 
parent, and with broken acuminations. 
