I12 
at the southern end. Only one vein runs at right angles 
to this general direction. The veins are about 15 feet 
(4-5 m.) apart on the average, and dip to the east from 
37° to 87°. The vein walls are rectilinear in the gneiss 
and gabbro-pegmatite, but in the gabbro they are more 
inclined to irregularity. A banded vein structure is 
general, the typical vein having a comb of black or dark 
pyroxene crystals growing at right angles to the vein-walls 
Mica [phlogopite] with pyroxene [P], apatite [A] and calcite. Vein matter, 
and possessing terminal faces on the ends which project 
into the vein. Next to each pyroxene layer is a band of 
mica crystals, with their cleavage planes more often parallel 
to the vein-walls than at right angles. Each mica layer 
is succeeded by one of green apatite, and the centre is. 
