Mineralogical Journey. 357 
wax yellow color. The smallest of these crystals, which are less 
than an inch in diameter, are occasionally regular, and nearly trans- 
parent ; while the larger ones are extremely irregular, consisting of 
interlaced and contorted prisms, with but one or two polished faces, 
and these much channelled. 
- We were scarcely less interested with a crystallized Mica, which 
we found here, than with the Beryls. It exists in considerable 
abundance in the immediate neighborhood of the Beryls, and the 
same blasts which serve to lay open the one, will also develope the 
other. The form of the crystals is that of the six-sided table; the 
Mica prismatique of Haity. They occur thickly implanted upon veins 
of a white, massive, and nearly compact Feldspar, adhering by one 
or two sides of the prism, and shooting into the Quartz. The great- 
er portion of the enveloping Quartz, is easily removed by means of a 
light hammer and pick, leaving the Mica firmly attached to the Feld- 
spar, with its smooth and polished crystals pointing outwards. ‘The 
tables are seldom much above one-eighth of an inch in thickness, and 
vary in width from half an inch to an inch and a half.. They are less 
transparent in the direction of the axis, than in a line perpendicular 
to it; and possess the curious property of presenting different col- 
ors when viewed in these directions, being liver-brown in the first, 
and olive-green in the second. The well defined characters of 
these crystals, and the elegant manner in which they are disposed 
upon the feldspar, give this locality a decided superiority over any 
other hitherto discovered in the United States; and will, I have no 
doubt, cause it to be much frequented by mineralogists. 
The Rose Quartz, though exceedingly abundant, we “did not 
cause to be explored to any extent. The rose tint is delicate, though 
not intense. It has however too much of the fracture of common 
quartz, to render it deserving of much attention. —— 
I shall conclude my account of the. Acworth minerals, by the ‘no- 
tice of Columbite. In the cabinet of Mr. Gallup, of Woodstock, 
Vt. we had the pleasure of being presented with a very unusual crys- 
tal of this mineral, still rare, though found in several places. It had 
been in the possession of Mr. G. for some time ; and was discovered 
by him along with two other similar erystals, one of which also, “he 
showed us afterwards at Hanover, and the other he informed us was 
in the hands of Prof. Hale, of Dartmouth College. Unfortunately, 
Mr. G. could recollect nothing precise, either with regard to the par- 
ticular place where he procured them, or, as to the-abundance or 
