80 _ Al Description of a new Mineral Species. 
According to M. Dufrenoy, nti the reflective goniometer, the an- 
gles are , 
M on X 130° 5’ or 130° 10’ 
X on X’ 142° 10’ 
In the second edition of our memoir on the Mineollagy and Geo- 
logy of Nova Scotia, we compared this mineral with the Davina of 
Monticelli and Covelli, which we had not then seen. It differs very 
obviously from this mineral, in external, a8 well as chemical charac- 
ters, and composition. 
The following is the composition of Davina, which the reader may 
~ compare with the results of Mr. Hayes’s analysis of our new mineral. 
Davina. Ledererite. 
Silica, 42,91 Silica, 49.470 
Alumina, 33.28 Alumina, 21.480 . 
Lime, 12.02 Lime, 11.480 
Oxide of Iron, 1.25 Soda, 3.940 
Water, 7.43 Phosphoric acid, 3.480 
Loss, suet Debt Oxide of -Iron, = .140 
Foreign matter, .030 
Water, 8.580 
Loss, 1.400 
We propose for this mineral, the name of Ledererite, in honor of 
the Austrian ambassador to the United States, Baron Lewis Von Le- 
derer, who has done so much, by his zeal in this — of na- 
tural history, to encourage and facilitate its study. 
Analysis of the Ledererite 3 by Mr. A. A. Hayes of the Roshery 
Laboratory. 
The Ledererite presents the following characters. ; 
When heated in a small mattrass, it becomes white and opake and 
gives off water, free from acid, or alkali; a slight empyreumatic odor 
is perceptible. 
In the forceps, before the blowpipe flame; it becomes aie and 
divides at the natural joints; at a higher temperature it fuses into a 
white enamel, which can be rendered more vitreous by continuing 
the blast; a few bubbles are disengaged when it is thus treated. 
On a platina wire, with its bulk of soda, a fragment fuses, with 
effervescence, into a white enamel, which is unaltered by exposure to 
