Geology and Mineralogy of apart of Massachusetts, Sc. 35 
brown, with a high pearly lustre, and translucent ;—the 
rhombs are very distinct. It isa beautiful mineral. It oc- 
curs also in the west part of the town associated with tre- 
molite. Emmons. 
Var. 2. Dolomite. 
Sheffield, Great Barrington, Stockbridge, Lee, Pittsfield, 
Adams, &c. Generaily whitish; in Stockbridge, near the 
meeting house, gray. In Middlefield, it occurs in mica- 
slate, dirty white, finely granular, phosphoresces by friction. © 
Emmons. In New Marlborough, containing augite, as 
well 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- 
nington, and may also be seen from the summit of Saddle 
Mountain, &c. 
9. Fetid Carbonate of Lime. 
White and coarsely 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. 
