On the Serpentine Rocks of Hoboken, N. J. &e. 21 
The remaining fluid mene into Epsom salt. Hence 
100 parts of the mineral consist of 
agnesia ~ - 46,0 
lex - + - - 36,0 
Lime - - on wie: RQ 
Water 15,0 
Prowosig. of ix iron fat keane 0,5 
99,5 
Loss 5 
*100,0 
“af pra composition alone were to guide us in the 
classifi n of minerals, in this instance more tally simi: 
ia not as yet er aesomcttes with any xy hr ti int 
tion, I consider myself as rather justified in considering it a 
distinct mineral, and more particularly, as it might on equal 
srounds be referred to tale or steatite, from all which its 
external characters sufficiently remove it. From steatite, 
which does not essen Ax Phas differ from tale, it is su ly 
distinguished by the peculiar association and form of its la- 
mina, their opacity, gees  infusibility. Its spe- 
cific gravity, inferior bards a ——. ompositi 
equally remove it from’ 
po a bo Steno Arn the latter itt ences 
of asbestus. — 
sian ts the remarkable predominance o apnea in al 
W f Hoboken, 
. wr 
Ts 
ae = any ‘alum, and-only-a oe minute and 
simon accidents portion of lime, itis evident that a profita- 
ble and extensive ates: - oe salt, now so pach used 
pte Baltimore mineral ‘contains: only 30 per ik i and notrace 
