MINERALOGY. 33 
ings have been made with the hope of profit in view. Chalcopyrite is 
found associated with other sulphurets in metallic veins, and also in little 
deposits on the walls of dykes, and in the surrounding rocks. It is usu- 
ally massive, but at times it shows evidences of crystallization ; and at 
Copperas hill, across the Connecticut in Strafford, very pretty crystals, 
formed by the twinning of two tetrahedrons, are found. As localities for 
copper pyrites that are noteworthy, may be mentioned Bath, Franconia 
(in gneiss rock), Madison, Haverhill, Warren (on Davis’s farm), Lyme (east 
of the east village), Jackson, Shelburne, Unity, Westmoreland, Littleton 
(with bornite in White Mountain mine), Connecticut lake, Croydon, Plain- 
field, Orford, Gardner mountain, and Monroe. 
A number of specimens of chalcopyrite from New Hampshire were 
analyzed by Dr. Jackson,* but, as most of the analyses are of impure 
specimens, which were selected as ores, they possess no value for a 
report on mineralogy. It is sufficient to say that Dr. Jackson found, by 
his analyses, a number of ores sufficiently rich to be profitably worked. 
Analyses of ores of copper from New England are, however, not at all 
conclusive as to the value of mines. The following is Dr. Jackson’s 
analysis of chalcopyrite taken from H. Lang’s estate in Bath. The an- 
alysis agrees very well with the formula, and indicates quite pure copper 
pyrites : 
Copper, .- : a ‘ ‘ : zi - . ‘ ‘i i 32.5 
Iron, . . = . . 5 . % é : . . : 33- 
Sulphur, . : : a - ‘ . - ‘ . ‘ 31.2 
Silica, : ; es se : fete oe : 3.2 
99-9 
When occurring as a microscopic impurity in the rock, chalcopyrite is 
recognized by the lustre, which is given to the light reflected from its 
surface. Its deeper yellow color distinguishes it from iron pyrites. It 
is not often met with in rock study. 
19. ARSENOPYRITE [Fe As S]. 
Arsenopyrite or mispickel is not an uncommon mineral in our state. 
* Geology of New Hanipshire, 1844, p. 215. 
VOL. IV. 5 
