436 Scientific Intelligence. 
tremity on the two solid angles of the most obtuse lateral 
edges, forming diedral terminations at each ex- 
_.tremity of the prism. The faces of these termina- 
Prous were inclined to each other at an angle of 67° 
and a few minutes. The annexed figure shows the 
form of the crystal. 
6. Supplement to the“ Remarks on the Geology and Mineralogy 
“of a Section of Massachusetts, on Connecticut River, &c. con- 
‘tained in No. 2, Art. I, of this Journal, by E. Hrrcucocg, A. M. 
The following minerals, found in the region above named, 
were either omitted in the former list, or have been noticed 
since that was made out. 
Bog-iron Ore. In Greenfield and Warwick. 
Hornstone. Rare ; in Deerfield and Conway. 
Silicious Slate. In rolled pieces, on the banks of Deerfield riv- 
» ->° er; not abundant. - 
Barut, or Lydian Stone. Same locality. 
seis In an aggregate of greenstone, quariz, and calcareous 
> “Spar, in the greenstone range, Deerfield. Color black, 
“aii and th e crystals usually imperfect, or broken. 
Staurotide In mica slate; Northfield, | one mile east of the vil- 
lage, on the turnpike to Boston. The crystals observed 
were six-sided prisms. The same rock contains reddish 
garnets. 
THE LEVERETT RANGE OF GRANITE. 
This name is given to a granite range that emerges from 
the puddingstone near the centre of Amherst, and extends 
northerly, with some interruption, nearly thirty miles, through 
Leverett and Montague to Northfield. And, indeed, there is 
some reason to suppose that it again appears to the north of 
Northfield. The range is widest in Leverett, where its 
breadth is more than a mile, It is noticed in the “ Remarks,” 
No. 2, Art. I, of this Journal, and may be seen on the section 
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