54 
Mineralogical Cabinet. 
Genus VI. Tantatum-Ore. 
Sp. 1. Prismatic Tantalum-Ore. 'Triv. Columbite. 
938. L. Chesterfield, Massachusetts. ‘This substance has not 
939. 
940. 
reese 
yet been sufficiently examined to pronounce with 
certainty upon its nature. It appears, however, from 
its crystalline form, specific gravity, and other char- 
acters, to be the genuine Columbite. 
Genus VII. Unanirum-Ore. 
Sp. 1. Uncleavable Uranium-Ore. Triv. Pitch Ore. 
. Joachimsthal, Bohemia. 
Genus VIII. Crrivm-Ore. 
Sp. 1. Uncleavable Cerium-Ore. 'Triv. Cerite. 
. Westmanland, Sweden. 
Genus IX. CuHrome-Ore, 
Sp. 1.  Octahedral Chrome-Ore. Triv. Chromate of 
Tron. 
. Bare Hills, near Baltimore. In loose octahedral crys- 
tals. 
do. Massive. 
Genus X. Irnon-Ore. 
Sp. | ee * & 
Sp. 2. Octahedral Iron-Ore. Triv. Oxydulated Iron- 
Ore. 
. Mount Grainer, Tyrol. In octahedral crystals, in chlo- 
rite. 
. Munroe, New-York. do. and massive. 
. Sweden. In octahedral crystals, in chlorite slate. 
do. Granular, and variegated. 
. Munroe. Massive, and exhibiting sections of octahe- 
dra upon its surface. 
