Geology and Mineralogy of a part of Massachusetts, &c. 33 
truncated upon the alternate planes of the extremities as to 
form pentagonal sides, and terminating in three pentagonal 
faces. Also in Bennington. 
Var. Laminated. 
Adams, Stockbridge, and West Stockbridge, in granular 
limestone. As it will not take a polish, itis a troublesome 
mineral in marble. It often spoils a large table. The 
workmen call it spar. Abundant in Bennington,—used as 
a flux at the furnace. 
2. Granular Limestone. 
Very abundant. See the preceding Geol. Sketch. Oc- 
curs sometimes between the strata of mica-slate in Chester, 
—highly crystalline. Emmons. 
3. Fibrous Limestone. 
Between the layers of fine grained gray wacke, Troy,— 
in small quantities, beautiful. In W. Springfield, in veins 
in fine red sandstone. Emmons. 
4, Compact Limestone. 
Hudson, with shell limestone—fine, close grained. Also 
near Troy. Eaton. 
5. Agaric Mineral. 
Found by Mr. Root, of the Berk. Med. Institution, in a 
cavern in West Stockbridge. It is fine, white, earthy, 
partieles slightly cohering—in small quantity. 
Vor. VII No. 1. 5 
