MINERALOGTCAL NOTES. 
61 
Eraporuwa near Kolonna, Sab The mineral is exceedingly 
rare in the Kandy District (where I have only quite recently 
discovered it ; it is there found (1) in a curious rock from 
Dulmure, about 7 miles east of Kandy; this rock may be 
called a garnet spinel leptynite ; and is remarkable for the 
minute graphic intergrowths of green spinel with felspar which 
characterize it ; sillimanite also occurs, but very sparingly and 
is more conspicuous macroscopically than in a thin section ; 
and (2) in a coarse garnet-leptynite, blocks of which occur by 
the roadside, but not in situ , towards the eastern end of 
Gregory’s road (Upper Lake road, Kandy). In the Uva-Sabara- 
gamuwa District referred to, however, sillimanite is a fairly 
common and characteristic mineral, though by no means invari¬ 
ably present. The sillimanite-bearing leptynites are characteristic 
and easily recognized rocks; the colourless, shining, perfectly 
fresh lath-shaped cleavage surfaces of the sillimanite are very 
conspicuous in the slightly decomposed granulites. The silli¬ 
manite occurs in varying amount, but rarely if ever, however, to 
the total exclusion of felspar. 
III.— Phlogopite. 
Particulars of an almost colourless phlogopite mica from 
Ampitiya, near Kandy, are of sufficient interest to be recorded. 
The mica is found near a junction of crystalline limestone with 
granulite (a characteristic situation) ; the exposure is on the north 
side of the shallow valley between Ketawala hill and the main 
road about 3^ miles from Kandy. The mica occurs in six-sided, 
but not very sharp-edged, tabular crystals, not exceeding 4 inches 
in diameter. A natural parting parallel to the rays of the percus¬ 
sion figure and to the edges of the crystal, is sparingly developed. 
The optic axial plane coincides with the leading ray of the 
percussion figure, being thus in the normal position for phlogopite. 
The rays of the percussion figure are inclined to each other at 
angles of not quite exactly 60°; the angle K between the two 
secondary rays (Holland, “ Mica Deposits of India,” 1902, p. 18, 
fig. 2) being from 60° to 62°, the other angles 60° to 59°. There are 
scattered, gray-coloured, hair-like, and very thin lath-like inclu¬ 
sions, which are arranged in directions parallel and perpendicular 
to the rays of the percussion figure. The axial angle is small, so 
that the figure in thin flakes is apparently uniaxial and pieces of 
some thickness must be examined in order to determine the 
position of the axial plane. In, thick pieces the mica has a 
greenish tinge, and is faintly pleochroic in shades of very pale 
brownish-green ; thin flakes are quite colourless. 
