420 Scientific Intelligence. 
4. Description of two New Minerals and a New Earth; by Davip 
D. Owen, M.D., (Jour. Acad. Nat. Sei- Phil., vol. ii, Part. “ 1852.— 
(1.) Thalite—While examining, in the summer of 1848, the North 
shore of Lake Superior, situated in Minnesota, between Pigeon Point 
and Fond du Lac, particularly in the vicinity of Baptism River, I Ll 
The r of this mineral when pure is of a pale yellowish green ; 
iene and hardness about that of wax. Heated in a matrass it 
gives off water. Heated strongly alone in the forceps it Peed but 
does not exfoliate ; tinges the outer flame slightly green. In thin splin- 
ters it fuses on the edges. ith borax it dissolves with difficulty par 
a transparent bead, which has a greenish tinge when hot. With s 
it = but = seve os —— slowly. _ Heated with nitrate of 
impurities. The pure varieties contain no. carbonic adi. Specific 
gravity 2548. It hae not been found crystallized. 
Treated with cet acid, partir is — and the greater 
per cent. of alumina separaied, leaving 
matter quite insoluble in that reagent ; of this lo per 
nt. was peroxyd of iron, and about 12 per cent. the new earth above 
alluded to, slightly contaminated wi agnesi 
bes, analysis ef the mineral is therefore as Gihoty: : 
Si AL Be Wow tasty Me K Mn 
42 46 15 10-12 205 08 trace 18 
et was” found pI: difficult to free this earth entirely from 
event , however, in < arating the 
