414 MR. A. K. COOMARASWAMY ON THE [Aug. 1902, 
The finest examples of these intergrowths were obtained at a. 
point three-quarters of a mile west of Ulisna Muduna trigonometrical 
station, along the footpath that descends the slope in a south-westerly 
direction (see map, Pl. XIII). 
V. Noreés on tHE ACCESSORY AND Contact-MINERALS. 
(1) Diopside.—Colourless monoclinic pyroxenes associated with. 
the limestones and their contacts with the granulites are referred to 
as diopside. The monoclinic pyroxene of the pyroxene-granulites. 
possesses always a green colour, though sometimes pale, and it is 
referred toasaugite. The diopside of the green-rock contact-zones 
has sometimes also a pale-green colour." Much diopside is present 
as the sole constituent of some white silicate-aggregates, or associated 
in them with other minerals, such as blue apatite and mica; it is. 
also occasionally present as a constituent of the limestone-rock, 
with or without accompanying olivine. 
(2) Olivine (forsterite).—Colourless olivine in crystals almost 
always clearly visible macroscopically (and even reaching 1 inch in 
length) 1s very commonly met with. Very often the limestone carry- 
ing olivine has a grey or dark-grey coloration, owing to the deposition 
of granules of iron-ore along the irregular cracks in the olivine. 
Alteration to serpentine is not very common, the crystals being 
very fresh. 
Alternations of pure and olivine-bearing limestones give the 
effect of a white-and-grey banding. Such bandings are always 
parallel to the general strike. Olivine-bearing dolomites are well 
seen at Ampitiya, in quarries north-east of Ketawala trigonometrical 
station, and along the roadside west of the same point (Pl. XIII). 
An analysis of olivine from Ampitiya is quoted on p. 415. Olivine 
is unusually abundant in. and gives quite a dark colour to, limestones 
exposed on the Ambewela- Hakgala road, near the bridge over it, 
and near the 4th milestone. 
Another case may be referred to in greater detail. Limestone 
occurs in a patch of jungle near the Hakgala Gardens, near the 
remains of an old kiln, where lime was formerly burnt (Pl. XIV). 
The limestone forms a sort of cave; it is doubtless a continuation of 
one of the bands which slope up from Harakgama. The minerals 
present are calcite, dolomite, olivine, phlogopite, pyrite, and pink 
spinel. The olivine in some specimens appears grey, in others 
yellowish; but these colours merely result from very slight quantities 
of iron-ore deposited along the cleavage-cracks. . Grains treated for 
some hours with dilute hydrochloric acid become quite colourless. 
Such treatment serves to isolate the olivine, and seems to attack it 
very little or not at all. The grains obtained consist of separate 
flattencd crystals, averaging 2 to 3 millimetres in length, and of 
more irregular aggregates. The flattened grains show in “coniyerseut 
‘Tn one case a quite dark green pyroxene occurred in limestone (at Heri- 
mitigala) associated with scapolite. This pyroxene resembles the ‘Tiree 
‘coccolite, and probably belongs to the hedenbergite group. 
