Wal, 58. CRYSTALLINE LIMESIONES OF CEYLON, 415 
polarized light the emergence of an obtuse bisectrix. The optic 
axial plane is at right angles to the elongation of the crystals, which 
are thus elongated in the direction of the vertical axis, and flattened. 
parallel to 6 (010). 
Cremicat ANALYSES OF ForsTERITE AND SERPENTINE FROM CEYLON. 
4" II. ITI. IV. We 
Per cent. Per cent. Per cent. Per cent. Per cent. 
5 ee 42°55 41:16 42'8 39°25 39°88 
J) (0 re 0:23 fee sh 1:78 318 
72,0 eer nae 2:58 ee a 
tO re 2°36 ae 2:6 Ea: # 
SL) ree 1:43 Pa e 1°84 1-75 
LL eee eee 5L-97 52°60 5d°4 39°CO 38 ' 64 
eae H,O(hyer ic) O°6 2 
Loss on ignition . 1°68 HOGabceN so .. (H,0)1813 - 1655 
100°22 100°1 100°8 100-00 100-00 
Sa ere o14 3:13 
I. Analysis of forsterite from Hakgala, by Mr. G. T. Prior, M.A. 
II. Analysis of forsterite from Ampitiya, by Mr. W. C. Hancock. 
III. Analysis of forsterite from Kandy, by M. H. Arsandaux, Bull. Soe. frang. 
Minéral. vol. xxiv (1901) p. 475. 
DY \ Analyses of green and white serpentine from limestone, Wattegama. 
‘ie level-crossing, by Dr. Schiffer, Inaug.-Dissert. Munich, 1900. 
It is noteworthy that the olivine does not occur specially near 
junctions with the granulites, as does diopside, but is more common 
than the latter in the main masses of limestone. 
(3) Mica.—Colourless to golden-brown micas, less often pale- 
greenish, are everywhere commonly found either scattered through 
the limestone (and then more or less idiomorphic), or accom- 
panying malacolite, apatite, spinel, etc. in silicate-aggregates which 
weather out on the surface of the limestone. The most usual types 
have the colour and pleochroism of phlogopite, but are very pale, 
often colourless in thin section if not macroscopically. Greenish- 
brown micas, with the optical characters of phlogopite, are some- 
times characteristic of impure bands in limestone near junctions 
with the granulites. 
A dark-brown mica was found with hornblende in limestone at 
Wariapola. 
Near Talatuoya several diggings for mica have been made; and 
it is probable that this mica occurs in connection with the 
junctions of limestone and granulite. It belongs chiefly to phlo- 
gopite, with various warm brown shades. The crystals are often 
idiomorphic, and not often more than 6 or 8 inches in diameter. 
Some have curious, flattened, black, lath-shaped inclusions, arranged 
parallel and perpendicular to the rays of the percussion-figure. 
Quite dark greenish-brown or green micas (nearly uniaxial) 
occur with diopside, amphibole, and spinel in the heavy green rocks 
sometimes found between the limestones and granulites (Talatuoya). 
(4) Spinel.—Pink and violet-pink spinels are very cemmon 
