CERIUM. 
441 
LOCALITY. 
This mineral, still rare, has been found since the commencement of the Survey, in a vein 
in feldspar and quartz, in the town of Monroe, Orange county. I received a specimen from 
Dr. Horton, which has the following characters : The mineral is massive, although it has 
the appearance of being a part of a crystal. Colour brownish-black. Dull on the outside, 
but the fresh fracture has a resinous or imperfectly metallic lustre. Powder brown. Opaque 
or feebly translucent on thin edges. Very brittle. Fracture uneven or small conchoidal. 
Hardness about 6.0. Specific gravity 3.60 to 3.65. It forms a jelly with muriatic acid. 
An analysis of this mineral gave the following results, viz : 
Protoxide of cerium,. 24.90 
Silica,.„. 30.50 
Alumina,. 11.25 
Protoxide of iron,.^. 22.27 
Lime,. 9.87 
This approaches very nearly to the composition of the Cerine found at Bastnaes, near 
Riddarhytta, in Sweden.* The Cerite of Hisinger, Thomson and Phillips, Cererite of Beu~ 
dant, appears to be quite a distinct mineral. 
* The composition of this mineral, according to Hisinger, is as follows : 
Silica,.30.17 
Alumina,_ 11.31 
Protoxide of cerium,. 28.19 
Oxide of iron,. 20.72 
Lime. 9.12 
Oxide of copper,. 0.89 
Volatile matter,. 0,40 
Min. — Part II 
56 
