410 
laterally more micaceous. 
MR. A. K. COOMARASWAMY ON THE 
[Aug. 1902, 
A thin slice from the central part 
(sp.gr. = 2°96) shows much augite (very pale green to bright green), 
one of Mopside-rock, and 
~ 
~ 
Lig, 4,— 
Band of acid granulite in limestone, separated from it by a 71-inch 
passing into lenticles of corresponding character. 
wy 
|A length of about 2 yards is shown. ] 
often with dark rod-like inclusions, 
and an equal amount of zoned 
plagioclase, most basic internally. 
Magnetite is abundant, and some 
pyrite is also present. Quartz is 
rare or absent, with the exception 
of a streak 2 millimetres wide, 
parallel to the foliation, consisting 
of elongated quartz - individuals. 
Scapolite appears to occur. Other 
minerals present in quite small 
quantity are hypersthene, biotite, 
and apatite. Without the scapolite, 
the rock would be an ordinary 
pyroxene-granulite. Another slice 
from a specimen nearer the edge 
of the band (sp.gr.= 2°99) contains 
much brown mica and hornblende, 
with green augite and plagioclase 
less abundant than before, and 
limpid seapolite tending to occur 
in plates moulding the other 
minerals. A third slce from the 
micaceous edge of this band (sp.gr. 
=3'16) is composed of diopside, 
phlogopite, pyrite, and scapolite. 
The diopside is partly in graphic 
forms standing out against the 
scapolite. The limestone at the 
junction (which is not abrupt) 
contains calcite, olivine, very little 
diopside, green spinel (black macro- 
scopically), and much pyrite, the 
last confined to a zone 2°5 to 
5 centimetres wide next to the 
pyroxene-granulite band. ‘The 
last-named band, however, is not 
quite continuous, but is interrupted 
by a tongue of limestone a few 
inches wide, which crosses it, 
connecting the limestone on the 
east with that on the west of the 
band. This hmestone-tongue forms 
thus a sort of dyke crossing the 
band of pyroxene-granulite, 
In the second case a band 
of white acid granulite is seen in the limestone (fig. 4), 2 yards 
west of the darker band just described. Here the acid granulite 
