^38 Scientific Intelligence, 



vein. The gangue is nearly an equal admixture of sulphate 

 of barytes and quartz ; and galena and sulphuret of copper 

 are disseminated through it in about the same, that is, equal 

 proportions. The blende, which is of a yellowish aspect 

 when the fractured crystal is held in a certain position, ap- 

 pears only occasionally. This vein is several feet wide, has 

 been wrought to a small extent in two places, and its direc- 

 tion is nearly north and south. It is on land of Mr. Field. 



Radiated quartz. In the above vein. A considerable! ten- 

 dency to crystallization appears at this place, not only in the 

 quartz, but in the foliated structure of the barytes. 



Brown spar. In the same place. But little of this mineral 

 was noticed. It exfoliated before the blowpipe, turned black, 

 and became magnetic. 



3. Of Spectdar Oxide of Iron in Montague. 



This is found in a partially detached eminence, 100 feet 

 high, near the north line of Montague, on land of Mr. Taft, a 

 little southwest froiri the confluence of Miller's river with the 

 Connecticut. The whole hill, not less than 100 rods in cir- 

 cumference at its base, is traversed by numerous veins of this 

 ore ; and scarcely a foot of the rock is to be seen that does 

 not contain these, varying in width from a mere line to several 

 inches. The principal vein appears on the top of the hill ; 

 and is, as nearly as I could determine, not less than ten feet 

 wide, lying in a north and south direction. The ore seems 

 to be abundant, and generally pure. Masses, that have been 

 separated by blasting, and weighing from 100 to 200 pounds, 

 lie on the surface. A small proportion of sulphuret of iron 

 was observed in some specimens. The gangue is quartz, and 

 the walls and hill granite. 



No opinion is here intended to be offered concerning the 

 probable value of these ores, if worked. If they be useless 

 to the present generation, they may not be so to some future 

 one, when labour shall be cheaper ; and therefore it was 

 thought to be of some consequence to point out their localities. 



In the remarks, to which this paper is a supplement, blue 

 quartz was inadvertently put down among the minerals found 



