T.S. Hunt on Euphotide and Saussurite. 343 
of anearly pure specimen of it was 2°729, of another fragment 
hig conjoined with its hardness, renders it probable 
that it isa feldspar; but it is very difficult to separate it from 
€ garnet, or even to distinguish between the two species by 
the eye alone. Another specimen of a white granular rock from 
the same locality, which had been taken for garnet, had a density 
of only 2800, and was supposed to be chiefly feldspathic in its 
ne The specific gravity of the greyish hornblende was 
A specimen of the first. described variety, having a density of 
3333 was selected for analysis; its powder did not effervesce 
with heated nitric acid, which however dissolved from it consid- 
erable alumina and lime. By the ignition of the rock, its 
yellowish color was only changed by the appearance of rare 
points of blackish-green. The analysis gave as foflows:— 
Oxygen 
a ee MAE es cacti 23-69 
pe rare ees 116 a oss BOS 
nye of iron,. .. : 5°20 UN es 
hes beveceveneens $458 ue 
BN 50s os aiock wah cate SP es as . 209 
OE MMR ac ccs «ings an inde eannt 1:10 
Soe and pyroxene in the above proportions.—( Geol. Survey of 
da, 9 
5. The great density of the i t rocks and 
it associ above described garne 
bs lation with homsblendés serpentine and gar led 
cheng uPPose that similar rocks ni pice ifferent 
history « some of the discordant facts which are met with in the 
te hundred and i 
mil 
: “responding chain of the Sassgrat, which forms a part of 
