118 Hydrate of Copper and Spodumene. 
ever, a difference in the aspect of the two minerals, and the 
results of the above mentioned analyses, prove them to be 
totally distinct.* Nepheline is the only mineral to which 
the subject of this paper is allied in chemical composition, 
but nepheline is much softer, is more fusible, and crystal- 
lizes differently, having for its primitive forma six sided 
prism, while the primitive form of the mineral in question 
is a rhomboidal prism. 
From the preceding experiments, therefore, the sub- 
stance which J have analyzed, must be considered as a new 
species in mineralogy, and I propose for it the name of 
Sillimanite, in honour of Professor Silliman, of Yale Col- 
lege. 
Art. IX.—Analysis of a Silicious Hydrate of Copper, 
from New-Jersey, with a notice of the discovery of two lo- 
calities of Spodumene in the United States. By Groner 
T. Bowen. 
[Read before the Academy of Natural Sciences of Philadelphia, March . 
Qd, 1824, from whose Journal it is copied.] 
1. Of the Ore of Copper. 
This mineral is found at Somerville, New-Jersey, in a 
copper mine belonging to Mr. I, Camaans. It occurs as an 
incrustation on the ferruginous copper ore of that mine, 
and is accompanied by native copper, green malachite, the 
crystallized red oxide of copper, and by native silver. It 
has been supposed by many mineralogists to be a phos- 
phate; the following experiments, however, prove that it 
contains no phosphoric acid. 
Its colour is bluish-green; colour of its powder light 
blue. It is massive and opaque ; its fracture is conchoidal 
and dull. It is brittle, and is easily scratched by the 
knife. Its spécific gravity is 2.159. Alone, before the 
*In order to ascertain the true composition of the anthophyllite, I an- 
alyzed a specimen of that mineral from Norway, and found my results to 
coincide, as to its constituent parts, with the analyses whieh are generally 
quoted in mineralogical books. _ 
