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 prismatiqiie of Haiiy . 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 ray 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, siill rare, though found in several places. It had 

 been in the possession of Mr. G. for some time ; and was discovered 

 by him along v/ith two other similar crystals, one of which also, he 

 showed us afterwards at Hanover, and the other he informed us was 

 in the hands of Prof. Hale, of Dartmoutli 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 



