T. S. Hunt on Ophiolites. 237 
has also observed among these rocks, the existence of mica in 
peers having the characters of erg cage and others in which 
hornblende replaces the mica, and which he compares to syenite. 
eat, which he supposes however to be often concerned 
_ inalterations of this kind; and he suggests that water, aide 
_ heat to produce the solution of the elements present, might give 
rise to the results there observed.—(Report on the Geology of the 
3rd District of New York, pages 108-110. 
oie found a portion of this ophiolite in powder, to be readily 
_ attacked by acetic acid, which dissolved a large amount of car- 
. ate ce lime, besides a. little magnesia, and traces of alumina 
This proximate analysis gave: carbonate of lime 
34-43, Sathonste of magnesia 2°73, serpentine insoluble in acetic 
acid, 62°50, iron a | alumina 0:34=100-00. The analysis of the 
serpentine gave m 
Silica, @ 5 P : - - 40°67 
Magnesia, : : - - - - 3261 
Protoxyd of iron, - ? - - - 812 
Alumin i 4 2 2 . ‘ 518 
Water, - < - - - . 12.77 
99°30 : 
No traces of nickel or chrome were detected. .A rounded 4 
eet, of greenish fine-grained limestone, which was imbed- 
this ophiolite, was found to be n early pure carbonate of 
presence of nickel and chrome, witch is so constant in 
the ophiottes of the Green geri is eames 
r 
from California, in th serpentin : 
gland). sod Pee (Scotland), ies in those of othe Vosges e 
Fran presence of chrome which characterizes so many 
been detected by Delesse in ike latter 
fom Co Ihave found it with nickel in a calcareous Ls Tk . 
age and have also detected nickel in a ete — 
“it. Rose, and in another fr a ts Pee nic: = an 
on have besides ioe found by Herm 5 ead : 
peerirania, and ‘Baa in ns erie pri onthe 
of th 
er in the olivines and tales 
ous localiti es has been noticed by Stromeyer and other 
SERIES, 
