O’Re1tty— Anatase and Brookite in Quartszites of Shankill. 735 
which traverse Bray Head, also mentioned in the papers already 
referred to. 
The quarry nearest to Shankill Castle (the entrance to which 
is from the road leading to Old Connaught) was being worked 
for road metal about ten years ago, and in the southern end 
of it, the quarrymen came on a joint filled with a soft yellowish 
earth, having a soapy feel, which they had not met with before, 
and which presented itself in such quantity that one of the men 
(Jos. Mills, of Shanganagh village) subsequently informed me 
that a ton of the earth might easily have been secured at the time. 
The sample which he brought me, at the time of the discovery 
was, owing to pressure of other business, put aside for future 
examination. This only took place last year, and meanwhile the 
quarry had been completely abandoned for years, so that no 
further traces of the joint, or of the contained earth could be found, 
and only an approximate direction of the joint in which it occurred 
could be determined. 
This direction would (according to Mills’ indication) be about 
N. 6°-7° E., and would correspond to a system of jointing which 
shows itself in the quartzites lying to the east of the Sutton Coast- 
guard Station (and quite under the Martello Tower) with marked 
frequency. 
Circumstances having led me to examine the sample in question, 
I first “‘ panned” a certain quantity of it, and was surprised to notice 
inthe ‘‘ tail” or heavy remaining residue, certain minerals, in a 
sufficiently crystallized state to allow of their further examination. 
Nearly the whole sample was therefore carefully panned, the 
heavy part separated, and this carefully classed according to size, 
and hand-picked, when necessary, under the lens. I was thus able 
to obtain a sufficient quantity of these crystals to allow of a deter- 
mination of their characteristics being satisfactorily made. A 
large quantity of quartz crystals were separated out, more or less 
cariated and imperfect; along with these occurred crystals of a 
somewhat metallic lustre, presenting forms referable to the tetra- 
gonal system, being for the most part doubly terminated tetra- 
gonal pyramids, with oscillations of the upper and lower faces as 
shown in the plate (fig. 2). With these occurred, a mineral having 
also a submetallic lustre, a brown colour, a platy structure, and 
evidently of nearly the same density as the former. 
