110) Mineralogy and Geology of the White Mountains. 
No. 3. Four feet wide; direction N. W. and 8. E.; inclines 
N. E. 35°; variable in color ; specimens of a yellowish brown, 
clouded with red; others of a handsome light gray; structure 
compact; fracture flaky, with sharp edges; translucent on the 
edges; fires readily with steel; minute iron pyrites diffused 
throughout ; effervesces briskly with sulphuric acid, like No. 2. 
No. 4. Direction E. and W. ; terminates abruptly ten feet from 
the water in a quartz vein, and with a disconnected lateral shoot, 
and intersects many quartz veins; curves at and beneath the 
water, and unites at the distance of five feet with No. 5. 
4a. Between 3 and 4, consists of three nearly distinct portions 
arranged in a curve; convex northerly; the terminations all ab- 
rupt, except the lower end of the lowest portion. These are, 
clearly, parts of what was once a continuous dike, and the dislo- 
cations evince a disruption subsequent to the injection of the 
trap ; width of 4 and 4a variable, from six to ten inches. 
No. 5. Direction E. and W. and two feet wide; breaks a few 
foots . the water and is dislocated doriborly: by its whole 
at the south side of the upper portion is in a line with 
the north side of the lower part ; continues up the inclined bank 
to the soil above, thirty or forty feet. 
In this and 4, and 4a, we observe the effects of one Silibeo- 
ting throw, which has displaced them all in the same direction ; 
whether the movement was N. or S., can be determined only by 
a critical examination of the rocks in place. 
No. 5 is exactly like fig. 89, in Lyell’s Geology, Am. edition, 
Vol. ii, p. 237. 
No. 6. Terminates eight feet from the water in a blade; inter- 
sects numerous quartz veins; six inches wide ; nearly perpendicu- 
lar; but the rocks dip at an estimated angle of 60°: another re- 
sult coincident with the contortion of 4 and 5, and probably from 
the same cause. Nos. 4and 5, we have seen, are united; but all 
from 4 to 6, inclusive, are so similar in mineralogical characters, 
they may be regarded as ramifications of the same main fissure, 
ejected from the same focus. 
Characters.—Color, black; fracture very uneven; granular ; 
‘strike fire with steel ; éonitain iron pyrites, and a aaah green min- 
‘eral diffused in mitalt dots, which in vitreous lustre and hardness, 
very nearly resembles olivine. 
