>. 
250 New Minerals from Tevas, Lancaster Co., Penn. 
consists of— x 
Atoms, Ratio. 
Silica, : : . AAO 22-7 6 
Magnesia, . ; 200 sy ira 
Alumina, . : 37 1 
Water ‘ 11:0 3 
100: 
with traces of oxyd of n $3 
It approaches there the ‘following : three atoms sesquisili- 
cate of magnesia, + one of silicate of alumina, + three atoms 
of water. 
3Mg O, Si0*18+ Al? O2, SiO*+ 3H. 
This mineral was sent to me aft L. White ered ay, 1 tae 
seams, sometimes above an inch in Parse between chrome 
iron ore and serpentine. It belongs to the order Mica, and has 
affinities with schiller spar (metalloidal diallage ).* 
New Haven, July 12, 1848. 
ttempting any fi formal description of them, They are very 
2 hi minute granular be i 
ta together, thin, dr 
and presenting an apple 
microse ape however, tine Pl resolve 
inet atak —the first conde of pea 
m the basis of the coating, next to the an 
. This is the hydrated cart 
W minutes in a glass tubeo 
ith a pecaliar odor, is ovelvad eh a Be if folia 
foliates and turns re dis -brown, the green 
‘of a 
k@,a quantitative analysis of the two which are 
aminations have been carried far enough to satisfy me that the foliated, pearly min- 
eral is a hydrated carbonate of magnesia and iron, and the green one, rated 
carbonate of mia aga esia and niekel, whith fuk the present may be c ised 
nickel magnesite. 
* 
