344 T. G. TAYLOR AND D. MAWSON. 
Classification.—Class II., Order 6, Rang 2, Subrang 3. 
Magmatic name.—Borolanose. 
IV. Essexite.—The specimen was obtained at Jellore 
Creek near the foot of Mount Jellore from the upper por- 
tion of the intrusive dolerite sheet. The rock showed 
abundant large plates of ilmenite, and although macroscopi- 
cally apparently fresh, was evidently partly decomposed 
from the large percentage of calcite which appeared in the 
microscope section. 
Composition of the “‘ norm ’’:— 
Quartz eo TACO Chromite gels °22 
Orthoclase ... 10°56 Pyrite... af "10 
Albite... vas.) 20°96 Apatite ah! 4 
Anorthite’ >... 6°67 Calcite coe EOE 
Nephelite Los Ol are Vanadic oxide 18 
Diopside -« LO508 Water ... pest) eee 
Hypersthene..:.. 6730 
Magnetite  .... 4696 + 1OGRS6 
Ilmenite san, ego —_—— 
In this case the norm is very different to the mode; the 
quartz, nephelite, diopside, and hypersthene of the former 
representing augite and biotite of the rock. 
Classification.—Owing to the advanced state of decom- 
position it is not possible to classify this rock correctly. 
V. Basalt.—This basalt obtained from the capping on 
‘* Woodlands ’’ was analysed as being typical of the numer- 
ous flows of the district. The specific gravities of a number 
of these basalts showed this particular specimen to be 
very slightly heavier than the average. 
Composition of the *‘ norm’’:— 
Orthoclase ... 6°12 Ilmenite ae 4°26 
Atoites.. we oe Apatite Ape 4: 
Anorthite we | BO19 Water ... sec) Dale 
Nephelite ; stall scans Mil a 
Diopside oe eae 100°26 
Olivine eg os Le —_—— 
Magnetite ... 3°25 
