C. U. Shepard—Mineralogical Notices. 111 
count as I was able of the results obtained. They were, Silica 
55°00, alumina 12-00, lime 6:00, protoxyd of iron 4°50, magnesia 
2°20, water 13°33=94°15. 
he mineral occurs in trap at Thore-Ghat, in the Syhedree 
Mountains, Bombay. 
which I have arrived. Though not so satisfactory as could be 
desired, some conclusions as to the constitution of the mineral 
may nevertheless be drawn from them. I devoted.most of the 
material, of course, to a search for the alkalies, but found none 
present. Of the rest, the larger part was used for the determina- 
tion of the water and silica, and of the bases as well as possible. 
The determination of the silica failed, through an accident; and 
the precipitate of alumina and oxyd of iron was melted with 
nitrate of potassa to see if a trace of chrome were present. 
ol the water. 
No. 1 (0°8239 grs.) was decomposed with hydrofluoric acid, 
and gave 0°1241 gr. Al?03, 0-025 gr. Fe*O%, 0.0595 gr. CaO. 
No. 2 (0°3695 gr.), decomposed in the usual way, with carbon- 
ate of soda and potassa, after ignition to determine the water, 
gave 0:0209 gr. CaO, 0-009 gr. MgO. 
No. 8 (0:095 gr.) gave 0:0156 gr. HO. 
Analyses. 
1 2 3. Average. Oxygen Ratio. 
Al, 16-06 seme oe 703 "08 2 
Fe, Hi (som 271 -60 
Ca, 7-28 567 645 1s4 3421 
Mg, iia ; 
i, eon. 368R  1G4R. 1880-34 Rt 
Si, (by the loss) = 5692 3036 3036 9 
100-00 
have the following composition: 
