LivERsSIDGE.— Analyses of a Rock Specimen from New Zealand. 505 
From which it will appear that the enclosed fragment cannot be regarded 
as quartz but rather as quartzite; it is probably a portion of some sedimen- 
tary rock which has been metamorphosed by the action of the fluid basalt. 
Taranakite.*—Taranaki. 
Art. LXXVIII.— Analyses of a Rock Specimen from New Zealand, showing 
the Junction between Granite and- Slate. By Ancnmarp Liversiner, 
Professor of Geology and Mineralogy in the University of Sydney. 
Communicated by Professor Hurrox. 
[Read before the Otago Institute, 8th N ovember, 1877.] 
I am indebted to the kindness of Capt. Hutton, F.G.S., Director of the 
Museum, Dunedin, for an opportunity to examine this most interesting 
specimen; although the dimensions of the specimen were originally only 
about one and a-half inches by one and three-quarters, and perhaps one 
inch in thickness, yet one-half of the specimen consisted of a fine-grained 
greenish grey-coloured slate, while the remaining portion was made up of a 
nearly white granite, possessing well-defined characteristics ; the crystals 
of orthoclase felspar are fairly well-defined and exhibit comparatively large 
cleavage planes; the mica and quartz are also distinctly developed ; even 
in so small a fragment the granite does not merge so insensibly into the 
slate as we might naturally expect, but the two are 
paratively well-defined line of junction. 
The following analytical results, which are each the mean of two 
analyses, show the differences in the chemieal composition between the 
granite and slate portions of the specimen. 
Analysis of the Granite. 
joined along a com- 
Moisture driven off at 105? C. ae T es s .287 
Silica .. ee T s = ia ++ 65:006 
Alumina me xà E < Irom 
Iron sesquioxide s à 3:237 
» protoxide . "872 
Phosphoric acid . absent 
Manganese protoxide :393 
Lime .. NS 2-145 
Magnesia = : "725 
Potash x = 3°294 
la e es «s s .. 8:809 
Carbonic acid 
5 2v As * . traces 
Undetermined constituents and loss UM xx « 1861 
100-000 . 
Specifie gravity — 2-619. 
= Rep. N.Z. Exh., 1865, P. 423. 
