254 
(I 1^]. S. Davis 
few f’l-Miiilcs, loi), plMKiiiclasc is only sliylilly sericitiscd, and in llu-sc n.f-ks 
as nnndi sanssnrilisfdion lias lakcn place as scricitisalion. These rocks are 
rich in niicrocline, and under llie microscope several id' lliein shown si»-ns (d' 
^n-nshin,!' and e\'en oi' I'anllin^’ cd' small displacement. 
'rA«i,K I. 
Mirroinelrir. An(iIi/.9(>s of (hsuells 
( Figures are voliinu' ]>ereeutages.) 
1. 
2 
3. 
4. 
(Quartz 
37-9 
35- 1 
.34 -tJ 
37-4 
Rlagioelase ... 
47-7 
4(>-7 
37-S 
19-7 
38-7 
Mieroeline ... 
10-4 
13-1 
24-4 
Muscovite ... 
!■() 
1 -S 
01 
2-8 
lilotite 
!•(> 
0-2 
0-5 
Chlorite 
0-S 
1-2 
2(i 
Apatite. 
Kpidot(‘ 
0-1 
1-7 
1 -0 
1 . (iranite centaininK sericitised plaf-ioclase. Read Hoanl Quarry (for analysl.s 
see. lalue il., eoluiun I) s])eoiin(‘ii 
‘>0 ViHt ('oniaining saiissuril ised niid seriei(ise<) ]>lagi()elase. SiK'oimen 
(Jranite eoiilaining clear felspar and a erusli l>r('eeia. Tho analysis is of the 
nnerusluHl part. Tho enisfi l>reeeia oeeiijues 14 per cent, of the scetion. Six'einicn 
20 , 70 (). ^ 
4. (iranite: gneissie wit li slightly tiirl.id hut unserieitised plagioelase. Speei- 
nien 2(>,7d4. ‘ 
* 'riu^ numbers rehu* to eatalogue<l spet'imens in t he General Golleetion at the 
^Jeology l>e])artment. University of Western Australia. 
'rAHiao 11. 
Avafi/scs of 
Darling 
Dauge Dmnites and 
oj (■erla.in 
“ Arm/ye” 
Types. 
I. 
2 
3. 
4. 
5. 
SiO., 
70-01 
73-49 
73 -Jit! 
73-30 
75- 99 
430.. 
0-20 
0-14 
0 04 
Oil 
0-09 
Al..().j 
13-14 
14-24 
13-88 
12-33 
13-14 
... 
I -08 
0-88 
0-84 
2-58 
0-93 
FeO 
1 -39 
0-92 
0-93 
1-28 
0-24 
MnO 
. . 
0-01 
tr. 
0- ir> 
0-02 
MgO 
0-02 
0-43 
O-f)! 
0-20 
0-08 
('aO 
. . 
0-2() 
1-84 
1-09 
0-40 
0-02 
Na^O ... 
3-90 
3-80 
3-22 
4-55 
3-92 
K.>() 
4-00 
3-42 
5-07 
4-20 
4-70 
11., O i 
0-28 
0-55 
0- IS\ 
r 
0-27 
H„() 
0-.30 
0-08 
0-11/ 
0-8tW 
0-08 
CO.. 
0-07 
I‘.,()r 
. . . 
0-07 
O-OI 
0-07 
0-05 
Hat) 
0-08 
0-07 
0-09 
0-03 
lA'So 
0-01 
0-05 
... 
99-80 
100-01 
100- 19 
100-00 
100 -09 
'fhe alkalis were (h'termined in a granite from Statluim’s by V. It. Le Mesurier 
in 11)21) ; giving Na^O 4-25 : K.,0 2-:iI ]H'r eeut.* 
1. Granite; Koad Hoanl Quarry, (to.snells. Analyst: C. K. S. Davis. 
2. Granite; (Jovernment Quarry, Hoya. Analyst: ,1. N. A. (Sraee.* 
2. Granite: Mahogany Ui'oek. Analyst: A. d. Robertson (Simpson, lOlb, 
p. IS). _ ‘ 
4. Alkaline (Jranite : Average of 10 analyses (Daly, IDd.’J, p. 10). 
5, Kalialaskil(‘ : Average of six analyses (dohaniisen, 1932, p. 49). 
* Rublished by kind permission of the Government jMineralogist and Analyst. 
