276 
Brendan P. Thomson. 
Closely related to the ordinary uralitised quartz dolerite is the variety 
in -which the felspar is tinted by pale-l)roAvn smoky clouding-. Only one dyke 
has been found to contain felspar in this condition. Kone have been found 
at Armadale, but, they occur farther north at Oosnells, Lower Chitterino- 
and Malkiij). 
According to AfacOregor (IJldl), such features are due to reheating 
of the rock aftei’ consolidation. 
The felspar varies from fn^sh labi'adorite, with the characteristic brown 
tint, to intensely saussuritised telspar and is in ophitic relation to the 
uralite plates. 
The uralite develops blue-gi‘een resori^tion borders in contact Avith 
the felspar and in ])laces appears to grade into brownish hornblende. 
I nstrauied (juartz forms a mesostasis and skeletal ilmenite, rimmed 
with leucoxeiu*, is common. 
Associated y(’mlets.~-Tn the uralitised (piartz dolerite, veinlets of epidote 
or ((uartz are tound up to two inches wide. 
2. Biotitic epidiorite. — This Armadale type has been found only near 
the prospecting shaft, north of Wongong Brook. 
Its Held relations are not known; it probably represents a phase of 
the uralitised (piartz dolerite. 
Alegascotiically it resembles a hornfels, being black and fine-grained. 
The thin se<'tion reveals an allotrioniorjihic granular aggregate of 
greenish-lirown biotite, small jilagioclase laths (which are almost completely 
converted to epidote), uralite, leucoxene, quartz and sparse pyrite. 
The biotite has the pleochroic scheme: — 
X = ]->ale yellow-green ; Y Z brown-green X < Y = Z. 
I ralite forms sparse patches Avith biotite wdiich is apjiarently derived 
from it. 
3. Porphyntic chloritc-albite epidiorite. — Aliiieralogically, this rock 
corresponds to the albit(' epidiorite of Armadale ( Prider, 1941). 
Hand specimens show yelloAV subhedral albite phenocrysfs (up to 
o cm. long), in a dark tine-grained ground mass. In the (^ardup specimens 
the phenocrysts are grouped radially, forming ‘A’osettes” up to 5 cm. in 
diameter. 
In thin section, albite phenocrysts are set in a ground mass of albite 
laths, uralite, biotite and chlorite with a little interstitial quartz and 
leucoxene. 
The albite is cloudy and contains ei>idote. The phenocrysts are 
rimmed and penetrated by the chloritic ground mass. 
I'ralite is rare and is a soda-rich variety with X < Y Z, X — pale 
yelloAv; Y — pale olive-green; Z = bright green-blue, Z /\ c = 17°. 
In the ground mass are found aggregates of deep-gi’een chlorite or 
decussate brown l)iotite, each containing several euliedral epidote crystals. 
D. Quarts Veins and Barite. 
The (piartz veins may be subdivided into — 
1. Quartz veins in the granite gneiss. 
2. Quartz veins in the Cardup Series. 
