68 ECONOMIC GEOLOGY. 
Robertson’s Corner to Madison Corner, just after passing the height of land south of 
the road, we find the schist in many places pyritiferous, and often much decomposed. 
There are also numerous beds of granite, or possibly they may be nothing more than 
immense veins. The schist, where it does not contain pyrites, is similar to that in 
Jackson where tin has been found, and here it belongs to the Montalban series. In 
Jackson, every locality where it was thought there could be any show for tin was 
examined, and an analysis of many of the specimens collected has been made by 
Prof. Seely, and very rarely has there been found even a trace of tin. The most 
promising localities away from the old opening are in the valley immediately north of 
Thorn mountain and on the west slope of the Black mountain, and the tin rocks here 
underlie the andalusite schists, at least on south end of Black mountain, and appar- 
ently uncomformably. On the west side of Tin mountain, near the Dundee road, the 
schist is pyritiferous, and there are numerous beds of granite; the rocks seem to be 
quite similar to those on the opposite side where tin has been found. Going north, 
the entire western slope of Black mountain, from its base half way up, seems to be 
composed of pyritiferous schists, beds of granite, and gneiss. There is a promising 
locality near Mr. J. R. Harriman’s; also, near the place formerly occupied by Mr. J. Y. 
Perkins. 
BismuTH, MANGANESE, ARSENIC, AND MoLyBDENUM. 
Native bismuth has been found upon Sunapee mountain, near New- 
bury. Nothing further than the fact of its existence is known. Manga- 
nese is not common in large amount. Bog manganese is reported in 
Gilmanton, Grafton, Lisbon, Haverhill, Laconia, Rindge, and Nelson. 
In Winchester and Hinsdale is a bed of impure rhodonite 8 feet thick, 
according to Jackson, enclosed in gneiss, dipping 70° S. 60° E. in the 
first, and 84° easterly in the second locality. When this mineral is pure, 
it is highly prized for ornamental purposes. 
The arsenical pyrites—mispickel or arsenopyrite—is very common in 
our state. It is most abundant along the Connecticut valley, both mas- 
sive and crystallized. Localities of note are Jackson, Francestown, Ha- 
verhill, Lebanon, Weare, Groton, Lisbon, Lyman, Middleton, Dunbarton, 
Epsom, and Alton. Should the manufacture of arsenic ever be called 
for, New Hampshire can afford a plentiful supply. This mineral is worth 
studying as a possible source for gold, silver, cobalt, and nickel. 
Molybdenum occurs quite abundantly at Westmoreland. Dr. Jackson 
examined the locality with care, and thinks the mineral is plentiful. It 
is the sulphuret, associated with blue compact feldspar and quartz con- 
taining apatite. Experiments have not been made to satisfy us whether 
