154 
PROCEEDINGS OF SOCIETIES. 
Wavellite has been found by Messrs. Jukes and Kinahan in the lower 
beds of the coal-measures, just above the limestone, about three miles 
north-west of Cahirmoyle. 
This mineral exhibits slight pyro-electric properties. I made this ob¬ 
servation on a small portion of the mineral carefully separated from the 
rock. As this mineral begins to lose its water a little above 100 de¬ 
grees Centigrade, the experiments were made within that range of tem¬ 
perature. 
The following are the results of my analysis :— 
Water,. 23*565 
A1 2 0 3 ,. 36*160 
Fe 2 0 3 ,. 1*812 
P0 5 ,. 30*881 
Si 0 2 ,.3*615 
Oxide of Nickel, Ni 0,.0*325 
Apatite, P0 6 , 3CaO,.1*578 
Fluorine, ..traces. 
Quartz,.1*003 
98*939 
If we merely take into consideration the phosphoric acid, alumina, 
and water, the numbers just given would correspond to the formula:—- 
( Al 2 0 3 
5 3P0 5 + 18 HO 
( Fe 2 0 3 
Several minerals have been described from time to.time, and classed 
with Wavellite, whose composition very much resembles the mineral now 
analyzed. Amongst those may be mentioned the Fischerite of Her¬ 
mann, for which the formula 2A1 2 0 3 , P0 5 + 8 HO, has been proposed, 
and the Peganite of Breithaupt, which, according to Hermann, has the 
same composition as Fischerite, but only containing six equivalents of 
water. 
One equivalent of the Irish mineral plus one of alumina, according 
to the above formula, should be equal to three of Peganite. 
The green colour of the mineral analyzed by me is due to oxide of 
nickel, while that of Breithaupt’s Peganite is, according to the analysis 
of Hermann, due to oxide of copper. 
I merely propose the above formula as an expression of a single ana¬ 
lysis ; but I may observe, that it is quite evident that a great many 
phosphates of alumina have hitherto been confounded together as 
Wavellite, and that the complete examination of the whole of this series 
of minerals would be a desideratum. 
I owe also to the kindness of Mr. Kinahan and the Geological Sur¬ 
vey, a conglomerate of quartz, cemented by white Wavellite, and found 
at some distance from the first specimen. It is worthy of observation, 
that nearly all the varieties of Wavellite are concentrated in this c&rboni- 
