T. 8. Hunt on Euphotide and Saussurite. 339 
limestones and. ophiolites of this most ancient geological series, 
sa great body of crystalline stratified rocks, eomposed essen- 
Song which passes through a ball of acdelte into hyper- 
€. Small quantities of epidote, garnet, and more rarely 
mica and quartz, are also met with, and magnetite and ilmenite 
we common. Different varieties of these rocks would be re- 
ferred by lithologists to the species labradophyre, dolerite, and 
te - The feldspars are sometimes very coarsely crystal- 
but often th they have a hardness of 6:0, and vary 
ties a The denser varieties are those in which lime and 
ina predominate; all of them contain besides soda small 
the L, BE. and D. Philos, Magazine, [4], ix, 262 
"Sige . ) eee f 
The euphotides dnanntyea by scinae and Lory are apparently 
tons More than varieties of dolerite, by which term we un- 
tide & rock composed essentially of a triclinic feldspar, with 
oor yariety of pyroxene, which may be augite, CL aenpetg 
aillage ccordin, j dite, which is the 
ant pyroxene regarded as characteristic of euphotide, has 
the external form of C 
Of Race tttuting the variety uralite, while in the euphotides 
tussurite replaces it entirely, giving rise to a rock composed of 
lt ome forming macles with others of hornblende, and the 
ine of pyroxene and. hornblende united in 
os manner. Since diorite is distinguished 
e substitution of hornblende for pyroxene, 1t 
ag 
