Mineralogical Journey. 359 
lege to Prof. Silliman and myself. ‘It did not, however, receive par- 
ticular attention until recently ; when we had the pleasure of finding 
it to contain, along with other things, two or three pieces of an appa- 
rently sienitic rock, filled with beautifully distinct and nearly transpa- 
rent crystals of Zircon, together with a small box containing a num- 
ber of loose crystals of the same substance. The majority of them 
are regularly terminated at one or both extremities. In size, they 
vary from one inch in length down to a quarter of an inch, and in 
diameter, from one eighth to one sixteenth of aninch. Their faces 
are nearly all equally perfect as respects their evenness, and are pos- 
sessed of a brilliant and somewhat adamantine lustre. In color, they 
are uniformly of a reddish brown, not sufficiently bright to bring them 
under the denomination of Hyacinths, from which they differ, more- 
over, in the character of their modifications, as will be seen from a 
view of the annexed figures. They approach in their general as- 
pect, nearer to the variety of this mineral from Frederiksvarn in Nor- 
way ; though they are not precisely identical with the crystals from 
‘that place as respects their form. Fig. 2 is the Zircon plagiedre of 
Haity, and fig. 3, the Z. binotriunitaire, of the same i i 
These are the only forms I could observe among the specimens in 
my hands. The former of them is said to exist among the crystals 
of Ceylon, while the lattet has not before been known to occur ex- 
cept at Trenton, N. J. where it was formerly found ina granite ap- 
proaching in character to gneiss. 3 
I said that the gangue of the Zircon was apparently a sienitic rock : 
such I am sure it would be pronounced in hand specimens seen at a 
little distance. | When viewed nearer by, however, the black lamellar 
particles interspersed among the Feldspar and Quartz, are discovered 
tobe Magnetic Iron ore. Notwithstanding the absence of Horn- _ 
blende which exists in the Norway rock, I am disposed to call it the 
true zircon sienite. ‘The Feldspar is of a greyish color often tinged 
by the oxide of iron, and exists in small angular masses in nearly 
equal proportion with the Quartz. 
As there were no tickets accompanying the specimens, I imme- 
diately addressed a letter to Prof. Fowler, from whom I Jearned the 
following facts» ‘The specimens forwarded were detached from a 
bowlder weighing about one hundred pounds, found.one mile north 
of Middlebury college, Vt. This mass is now in the ssi of 
Prof. F. The same rock occurs scattered over the surface in the 
Vicinity ; but “its proper geological position is upon the opposite side 
