52 PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
these analyses was made for the purpose of this paper, and 
neither is of rocks found in the immediate neighbourhood of 
the tourmaline-albite rock, so that no quantitative arguments 
could be safely based upon them. 
Of these analyses, No. 3 is that of a typical example of 
Brisbane Schist from the city of Brisbane. The Brisbane 
Schists are known to be made up of various types of altered 
rocks, but by far the greater part is micaceous schist, of which 
the analysis (3) should be quite representative. The Brisbane 
Schists in the locality under discussion are represented by very 
similar micaceous schists, so that the analyses quoted may give 
a general indication as to their chemical composition. 
Analysis No. 4 is that of a rock selected by the author as 
typical of the Pink Phase of the Enoggera Granite, and may be 
considered as a fairly safe guide to the chemical composition 
of the granite, which has all the mineralogical characteristics 
of the Pink Phase at this point. 
TABLE 1. 
ou 1 2. 3 4 
SiO, ee as 63-40 36-51 | 61-62 73-52 
Al,O; So WAR PAL Ha® Sp oarog 33-13 |; 21-20 11-05 
Fe,0O, Zz sb Weurene 1-6 Aiea 1-51 Nil 
FeO ge 5 A 0-28 10:30 1-93 3-15 
MoO os % aa 0:37 | 5:23 | 1:77 1:03 
CaO 5 ee 0-42 1:58 | 1-59 1:70 
Na,O A he Ss 8-57 | 2-14 | 3-39 4-08 
K,O =e Rete ee eM 0-35 | 0-15 3-07 3-99 
INORG he oi be ola ese Wa erie 3-29 0-44 
Ore | fe wcihy ces ee tly, te eee mete 0-16 
TiO, - er Tl SING aed 0-92 | 0-92 0-20 
P.O, iy 43 WP | 0-18 0-17 0-15 
MnO if. & epee 7" 0-40 | 0-07 is 
Br,O, es Ce aoaae 9-03 “a 
Motel. <;. ..| 100-12 | 100-00 | 100-56 99-48 
Analysis 1 = Albite in Tourmaline-Albite rock. Analyst, G. R. Patten. 
Analysis 2 = Tourmaline in Tourmaline-Albite rock. Analyst, G. R. 
Patten. 
Analysis 3 = Brisbane Schist. Analyst, G. R. Patten. 
Analysis 4 = Enoggera Granite (Pink Phase). Analyst, G. R. Patten. 
An examination of Analysis 1 shows that the felspar 
present is undoubtedly albite. but a consideration of the 
