420 MR, A. K. COOMARASWAMY ON THE [Aug. 1902, 
Mr. G. F. Herbert Smith says that 
‘besides these faces there are a large number (more than a hundred) of others, 
mostly very small. Some of these might, on calculation, be found to have 
simple indices. Most of them, however, have very complex indices and would be 
due to etching. It would seem as if, in this case, some of the original faces 
were still left unaltered.’ 
Mr. W. C. Hancock has analysed the clinohumite from Gettembe, 
with the following results :— 
Per cent. 
SIO, | tena ketene ee eee reer 3752 
Fe,O, (with a trace of alumina)... 9:00 
POUL cbt Rete ene eee eer nee 49°75 
NasO iy. geace Batende seer eeoeeeetes 1-44 
F '-  cesweetiiagaid hase gee eee eee 1:02 
HO (hygroscopic) tes. eres eee 0:50 
HO.(combbined)) seen cseeeee 1:00 
100:23 
Yellow clinohumite was also found in the limestone in the bed of 
the Madde Ela near Gettembe, associated with what may be a 
colourless variety. In a thin section, one case of twinning was 
observed; in the material from the limestone-pit no twins were 
found. A colourless variety of chondrodite from limestone from 
Ceylon has been described and figured by Prof. Lacroix’; the figure 
is, however, very suggestive of olivine. 
(10) Graphite.—Flakes of graphite occur commonly in some 
varieties of hmestone, though quite absent in others. The flakes 
are often more or less hexagonal in outline, and have a seemingly 
basal cleavage corresponding to that of mica. 
(11) Sphene was only noted as an accessory mineral in the 
Herimitigala limestone, but is common accompanying scapolite, 
calcite, etc., in the peripheral parts of pyroxene-granulites which 
show endomorphic modification in contact with lmestone. 
(12) Orthoclase was noted as an accessory mineral in lime- 
stone, on Allerton Estate, Rakwane; and once or twice in mineral- 
aggregates in limestone, in the Hakgala district. 
(13) Tourmaline occurs very sparingly in joints in the nodular 
serendibite-diopside rock-bands, and still more rarely in the intru- 
sive granulite, at Gangapitiya. Tourmaline from river-gravels is 
one ot the commonest semiprecious gems of Ceylon, but localities 
where it occurs in situ are unknown.” 
(14) Serendibite.—This name has been given by Mr. Prior and 
myself* to a mineral occurring at the Gangapitiya moonstone-pits, 
1 Bull. Soe. frang. Minéral. vol. xii (1889) p. 338 & fig. 60. 
2 Kor crystallographic details of Ceylon tourmaline, see V. von W orobiev 
‘ Krystallographische Studien tiber Turmalin von Ceylon u. einigen anderen 
Vorkommen’ Zeitschr. fiir Krystallogr. vol. xxxii (1900) pp. 263-454 & 
S. Vili-XIv. 
a Paver read before the Mineralogical Society on February 4th, 1902 
abstract in ‘ Nature’ vol. lxv (1902) p. 383. 
a a 
