8 TTT, LOOT IN ATE OTR GER OTRO GIG 
The feldspar of these rocks, like their other constituents, is 
on the whole very fresh. It is nearly always transparent and 
colorless, but here and there in some sections it contains opaque 
or cloudy masses of kaolin and grains of quartz. Its grains 
are approximately equidimensional. They do not interlock with 
FIG. 2.— Granulitic hypersthene-gabbro with aggregates of pyroxenes. A portion 
of one of these aggregates is shown in the upper portion of the figure. In the lower 
part is seen the granulitic mosaic of diallage and feldspar No. 8870. 
the irregular sutures of granitic feldspar, but they form with each 
other straight-edged contacts, like the grains of a microgranitic 
mosaic. In many rocks these grains are of about the same size as 
the grains of diallage, but in others they are so small that their 
oy) 
3 
ggregate between crossed nicols looks very much like a micro- 
granitic groundmass in which the larger pyroxene grains are 
c 
