68 ECONOMIC GEOLOGY. 



Robertson's Corner to Madison Corner, just after passing the heiglit of land south of 

 tlie road, v/e find the scliist 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. Sccly, 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 cjuitc 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 



