. 24 
of occasional phenocrysts of the characteristic opalescent 
quartz, bunches of biotite, and ver sparingly an ewe $ 
Taa of felspar. A few scattered grains of pyrites 
also pres 
The spei ipn of this rock is 2625. D!5-—270625. 
uartz and microcline are developed, showing allotri- 
morphic boundaries. The microcline shows Carlsbad twin- 
ning, but the grating structure may be absent or represented 
only by Mc RAP ag lines of light and shade 
Som me Haspon is present, and has the properties of 
dlipodlucs albite 
Secondary mica and kaolin are developed as alterations 
of the felspar. In a phenocryst of microcline the micasation 
may be well developed. 
A primary micrographic intergrowth of quartz and 
microcline is often present round the borders of a large 
quartz grain. A a scene of alkalies in this rock gave 
K,0=5°58%, Na,O=2 
The rock is a cepts Mierocline Aplite. parts 
fas a distinct granite-porphyry facies, but its relationship 
to eg associated intrusions is better indicated in the nam 
"n The Pink A plite.—This aplité occurs as a distinctly 
intrusive mass along the coast immediately south of Cannon 
Hil. Its g a ied the granite is in most piaces 
mar dy sha ass shows a somewhat variable 
r 
with vague REN in part of a distinct granite-porphyry facies. 
It is this rock that occur the quartz tourmaline 
nodules already « ater eet in detail in a previous paper.“ 
A number of quartz veins occupy fissures in the aplite, 
and associated with these veins occurs a gor Se altered aplite 
which. appears to be of the nature of a 
further alteration of the aplite is e production along 
"m fissures x a white Soina product. A number of quartz 
i e also developed. Solara arer of this 
1 ` n page 325. 
e White spect (Aplite).—There are a number 
of this type all of which are not noted o 
