344 T. S. Hunt on Euphotide and Saussurite. . 
“Mt. Rose.* The euphotides of the Alps according to other ob- 
servers are associated with protogine, ophiolites and crystalline 
schists. ‘ 
I had now before me the original euphotides which had been 
studied by Haiiy and de Saussure, and through the liberality of 
Prof. Guyot was furnished with numerous specimens of the ¢ 
acteristic varieties. Their examination has afforded me the 
following mineral species: saussurite, smaragdite, actinolite, tale, 
feldspar, and rarely pyrites. k 
The saussurite, which is generally predominant, is very wil 
form in its characters; it is always finely granular or compat, 
very tough, and with a sub-conchoidal or splintery fracture. Its 
color is white, passing into greenish bluish and yellowish-white, 
rarely with flesh-red stains; sub-translucent; lustre feeble, waxy. 
Hardness 7-0; scratches quartz. Specific gravity 3:33—3%8. - 
euphotide containing cleavable masses of smaragdite an inch in 
diameter, afforded me portions of bluish-white saussurite, app 
rently homogeneous, and having a density of 3°336 ‘B60. 
Another specimen of euphotide, containing a good deal of tale, 
and only small grains of smaragdite, had a density in the mas 
of 3°315, but selected fragments of the saussurite gave the 
number 3°385. Another large fragment of greenish-white sal 
surite had a specific gravity of 3-338, while a fourth speamen, 
euphotide holding only small lamellae of smaragdite, and mil 
gled with greenish-gray talc, had a distinctly granular textu™ 
and a density of only 3-16—3-20. 
The smaragdite of all these varieties of euphotide has a g™ 
green color passing into emerald and olive-green. Lustre ge 
what pearly; hardness 5:5; specific gravity of fragments 
the first-mentioned euphotide, 8-10—3'12. The smaragdite pat 
erally exhibits only the cleavages of pyroxene, but in come. 
it is irregularly penetrated by slender prisms of hornblen od. 
cis rarely absent from these euphotides, and is often @ ni 
ant in small foliated or radiated: masses, enclosed in the saus” 
rite. The tale is generally silver-white, but occasionally appear 
tals of dark gree 
ite. i 
A bluish-gray or lilac felds is often met wl “ey bl 
euphotides, i at once distacmiabad from the sane by 
its color, cleavage, translucency, vitreous lustre, an feldspar 
hardness. I have not observed cleavage faces of ee i 
more than a fourth of an inch in Jength, although in SOM™ hg 
mens it is rather abundant. Grains of it are sometimes” 
ded in the tale, but it more generally occurs in the 
* See also Jas. Forbes, Travels through the Alps, P- eter 
