T. S. Hunt on Lithology. 263 
zoisite, which has the hardness of quartz and a density of 3°, to 
have by most of the modern lithologists been confounded with 
saussurite, and hence the name of euphotide is frequently given 
to the so-called granitone or gabbro, which is only a diallagic 
variety of diabase. The true euphotide often contains a portion 
of tale, and sometimes encloses crystals of a triclinic feldspar, 
apparently labradorite, thus offering a transition to diabase. S 
arther my researches on Kuphotide and Saussurite (this Journal, 
[2], xxvii, 889, and xxxvii, 426. 
nder the name of dolerite, as already remarked, it is pro- 
posed to class such anorthosite rocks as contain a black ferrugin- 
ous pyroxene or augite. These rocks, which are sometimes 
ot may constitute several hundredths of the mass. 
any fin 
tions of some zeolitic mineral, and they often abound in chlorite. 
.t¢ommon among greenstones, and for 
needed. See on this point Geology of Canada, pp. 469, 605, 
and the remarks on melaphyre below. Se. 
_ The finer grained dolerites are often cellular, giving rise to 
amygdaloids, whose cavities are generally filled with calcite, 
