Geology and Mineralogy of a part of Massachusetts, &¢, 35 
brown, with a high pearl ape and translucent ;—the 
thombs are very distinct. It is a beautiful mineral. ‘Tt oc- 
curs also in the — part.of the town associated with tre- 
molite. EEmmon 
Var. 2. Dolomite. 
Sheffield, Great Barrington, Stockbridge, Lae Pittsfield, 
Adams, &e. Generaily whitish ; in Stockbridge, near the 
meeting house, gray. In Middlefield, it occurs in mica- 
slate, dirty white, finely granular, phosphoresces by friction. 
Emmons. Ip New Marlborough, containing augite, as 
|as tremolite. Somerset, with iron ore. 
Var. 3. Magnesian Limestone. 
Abundant—the common variety—in large beds. In 
Bennington is a large mountain of it, lying directly north of 
the great bed of iron ore and manganese, and formerly used 
as a flux in reducing the ore. When burned, it resembles 
dolomite. As the vegetables have been destroyed by fires 
on this mountain, great quantities, even acres of. this lime- 
stone, are entirely exposed to view from the village of Ben- 
a and may also be seen from the summit of Saddle. 
ounta 
9. Fetid Carbonate of Lime. 
White and coaree granular in Stockbridge—very 
abundant. Small specimens lose their fetid odour, after 
a little time,—at least, some of it is thus affected. In Wil- 
liamstown, dark coloured and fine grained, very fetid,—in 
loose fragments. Also, in Bennington—nearly black. In 
Alford, abundant, and very fetid, and not so coarsely gran- 
ular as that in Stockbridge. It has been supposed with- 
out the least reason to be plaster of Paris. 
10. Ferruginous Carb. of Lime. 
Bennington. 
