Miscellaneous Localities of Minerals. 2a3 
4, By Jacop Porter. 
Limpid quartz, in transparent prisms and well crystal- 
lized, on Broad Mountain, Penn. 
Laminated quartz, at Cummington and Plainfield. It 
occurs both of the milky and smoky varieties, and is very 
well characterized. 
Common jasper, generally blue, on the margin of a brook, 
Worthington. 
Plumose mica, abundant in granite, at Williamsburg. 
Black tourmaline, at Goshen. The crystals are gen- 
erally small, finely striated with a shining surface, and con- 
fusedly intermixed. Some of them are formed on granite, 
and protected by a covering of white quartz more than an 
inch thick. 
Scapolite, in the south-west part of Goshen. The crys- 
tals are often several inches in length. Their surface is 
very distinctly striated, the structure foliated. The lon- 
gitudinal fracture exhibits a shining and even metallic lus- 
tre, the color a lively silver gray; the cross fracture is 
often splintery. In some specimens the crystals are cur- 
ved, blended and curiously interlaced. Some of the smal- 
ler crystals have a shining surface, and are nearly trans- 
lucent. The scapolite at this place, as also at Chesterfield, 
is generally associated with white quartz. 
Cummingtonite of Prof. Dewey —The rock, that con- 
tains this mineral, has been known to the common people 
for several years, under the name of the Copperas Rock. 
Pieces of ithave been occasionally used in dyeing as a sub- 
stitute for the sulphate of iron. It lies by the road side 
in the east part of Cummington. 
White augite, at the celebrated locality of indicolite, 
Goshen. 
Magnetic oxide of ron, in small cubic crystals, at Plain- 
field. This variety occurs in arenaceous quartz. 
Black oxide of manganese, compact and earthy, at Cum- 
mington. There are also two localities of the compact 
variety of this ore in the westerly part of Plainfield, at both 
of which it occurs in great abundance, and of excellent . 
quality. 
Plainfield, Mass. June, 1824. 
Vor. VIII.—No. 2. 30 
