236 T. 8. Hunt on Ophiolites. 
is 
serpentine has a hardness of 3:5, and a density of 2:476—2°525; _ 
lustre resinous, shining; fracture conchoidal, without any traces 
of. crystallization; translucent; color honey-yellow, passing into 
oil-green and olive-green. III is a serpentine closely resembling 
the last, from a similar rock at the Grand Calumet Island; it has 
a density of 2°362—2-381, and a pale wax-yellow color. 
Silica, - “ os 89°34 40°10 41°20 
Magnesia, - he -. 43°02 41°65 43°52 
Peroxyd of iron, - - 1°80 1-90 
Soda, - - - (traces) 80 eee 
Water, ~ “ = 15°09 15:00 15°40 
99°25 99°55 100°92 
These serpentines, like the others from the same rocks already 
described, contain less oxyd of iron and a larger proportion 
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with others of a tufaceous cellular limestone. These strata 
seain overlaid by a limestone marked with peculiar needle- 
: porous lime- 
te: oie described, are very much altered; the shales are 
