THE QUIZZYHOTA LACCOLITE 87 
River along the main road from George to Knysna, about 5 miles 
from the former place; there is a small granite dyke exposed on the 
road section piercing the mica schists belonging to the Malmesbury 
Formation; about 5 yards from the granite the rock suddenly 
becomes full of well-formed andalusite crystals about an inch in 
length. The crystals are coated with scales of mica and usually 
have drawn out extremities in which mica flakes and andalusite 
substance have not yet become separated; some crystals, however, 
are sharply terminated. At the actual contact there is a thin zone 
of Cornubianite, never more than an eighth of an inch in width, 
in which there are small crystals of andalusite averaging .7 mm. 
in length and .15 mm.in breadth. Eye-shaped patches of the same 
substance occur where the schist has been kinked, and both crystals 
and “‘eyes”’ contain pellucid egg-shaped grains of quartz and a 
little red-brown mica, all that is left of the original sand grains and 
mica-flakes of the original rock. Occasionally a mica-flake of the 
schists ends abruptly at the margin of the andalusite, and in the 
latter there is the continuation of the flake rounded off in the usual 
manner of these inclusions; the flake has the appearance of having 
had its end melted and a portion incorporated in the new crystal of 
andalusite. When the crystals of andalusite have sharp ends, the 
dome faces are not equally developed on either side of the end; 
they follow the sides of the original kink of the shale in which the 
substance has been deposited, as if the crystal were monoclinic— 
another instance of the feebleness of the crystallizing force in the 
terminations as compared with the sides. 
The larger crystals may be divided into the perfect forms and the 
irregular ones. In a longitudinal section of the former the sub- 
stance of the andalusite is transparent with the usual pleochroism. 
Trains of rounded black dots and stout, short rods of rutile follow 
more or less the direction of the planes of parting. The black dots 
are graphite showing in reflected light an adamantine luster with 
white faces; they are probably carbonaceous matter that has 
aggregated in the andalusite substance from the flocculent material 
in the schists. The rutile needles also appear to have been enlarged 
from the minute ones in the biotite flakes. Rounded flecks of 
red-brown mica occur throughout the substance as well as the egg- 
