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EXPLANATION OP PLATE 2. 
Pigure 1 — - 
Hybrid gneiss from tlie Roads Board quarry, Armadale, shorving xenolithic 
character of the gneiss. The xenolitlis are of biotite-hornblende-epidote 
liornfels (dark coloured') and epidotic material (light coloured). The 
banded character of some of this gneiss is seen in the top left hand side 
of the boulder. Quartz xeuoliths are present (the coin is lying on one) but 
they are indistinct in the photo. The clinometer gives the scale. 
Pigure 2. — Pliotomicrographs of quartz veins. 
A. Sericitic rock from shear zone in gneiss, with secondary veinlets of quartz 
(from large quartz blow near the Bedfordale Road). Ordinary light x 40. 
B. Strained quartz from the same locality as (A). The entire field (and 
almost ad of the slide from which this photo was taken) is part of the 
same crystal. The strain pattern is interesting, consisting of subparallel 
lines along which actual granulation has taken place arranged obliquely 
to the direction of “slicing” or gliding shown by the strain shadows. 
Nicols crossed x 40. 
C. “Vein” quartz from the slate quarry. Occurs as masses in the slates. 
Shows unstrained character and even granular mosaic structure. Nicols 
crossed x 40. 
