270 W. R. BROWNE AND W. A. GREIG. 
I. If. ITI. LV. Vv. 
VO; 0-04 0:07 fie eA! 
SO, Oza 0:05 er 0-15 
Ol trace trace th an 
is) abs. abs. abs. 
‘Cr.O, 0:03 0-02 beshy 
NiO & CoO _ trace trace 0:03 
MnO 0-11 0-14 0-18 
BaO 0:04 0-04 0:09 
‘SrO trace* trace* 
Li,O abs. abs. 




100-02 100-24 100-03 100-19 
Sp. gr. Zo 2 2°937 on 2-791 
* Spectroscopic. 
I. Quartz-monzonite, Kiandra, N.S.W. Analyst, W. A. Greig. 
II. Monzonite-porpbyry, Kiandra, N.S8.W. Analyst, W. A. Greig. 
ILI. Quartz-diorite, Tuolumne Co., California Analyst, Hillebrand. 
IV. Enstatite-porphyrite, Bolmke Thal, Harz., Analyst, K. Hampe. 
V. Brogger’s average monzonite. Die Triadische Eruptionsfolge 
bei Predazzo, p. 51. 



These figures, with the very concordant specific gravities, 
indicate that the two rocks are practically identical 
chemically, a state of affairs that was not so evident from 
the petrographical examination. 
Oalculated according to the C.I.P.W. system their norms 
-and classifications are :— 
Quartz-mwonzonite. Monzonite-porphyry. 
Quartz... as) 198 4°68 
Orthoclase Dae jhareds 15:01 
Albite ... rae Ue) 20:96 
Anorthite eal zallod el 18°35 
Diopside eno 14°80 . 
Hypersthene ... 19°50 22°43 
Magnetite it WA 1:86 
Ilmenite RA id eee, 122, 
Apatite so O34: 0:34 
IQ(1I1). 4(5). 3. 3(4) “IIL. "5. 3. 3(4) 
Harzose. Kentallenose. 

