and Union of Supposed Distinct Species. 307 
crystals, or, in some of them, not existing at all. Some of the 
Zeolites, in the Nova Scotia trap, have been found associated 
with small crystals of phosphate of lime, and it is not impos- 
sible that some of the minutest of these may have intercrystal- 
lized with the Ledererite. We regret that we have not been 
able to obtain other specimens to enable Mr. Hayes to give it 
a reéxamination. For comparison, I subjoin the analyses of 
Ledererite and Gmelinite. 
Ledererite. Gmelinite. 
Silica, 49.47 : 
Alumina, 21.48 18.05 
ime, 11.48 6.13 
Soda 3 
, .94 3.85 
Phosphoric acid, 3.48 Potash, 0.39 
Protoxide of iron, 0.14 0.11 
ater, 8.58 21.66 
98.56, Hayes. 98.75, Connell. 
Now, if the phosphoric acid, in Ledererite, is united with lime 
as an accidental mixture, 2! per cent. of the lime should be 
taken from the 11.48 per cent found in the mineral: this 
brings the proportion down nearly to that obtained by Connell. 
Mr. Hayes was not able to determine the weight of the water 
With accuracy, owing to the small quantity of the mineral 
Operated upon. As the loss (1.44 per cent.) was mostly 
water, we may suppose, with Rammelsberg, that Ledererite is 
melinite containing (1?) its quantity of water. The chemi- 
formula for Gmelinite and Chabasite is thus : 
m 1 
. 
Excepting the absence of striæ, and the shorter dimensions of 
Prismatic planes of its crystals, the Irish Gmelinite precisely 
fre Handuirterbuh, i. 150. Rammelsberg unites Chabasite and Gmelinite, the 
"38 soda Chabasite, the last as lime Chabasite. This is in accordance with 
Tamnau, who has ¢ tablished their identity on erystallographical grounds. ‘The close 
Pre of the two minerals was, however, first shown by Prof. Mohs. See his 
Vol. ii. p. 105. 
