296 
Analysis of Iron Ores. [Oct. 
green glass. The blue lamina 1 burn with the scintillation peculiar to iron, become 
porous, and have a metallic tarnish ; they appear to lie a dent-oxide of iron. 
When calcined, the pulverised ore, which is of a yellow brown, changes to a deep 
chocolate red, probably from the privation of the carbonic acid. 
Constituent parts. 
Water and carbonic acid, 8,50 
Silex, “1 >00 
Alumine, 4,75 
Carbonate of Lime, 5,15 
Deut -oxide of Iron, 75,00 
Oxide of Manganese, 1,55 
99,95 
Note This specimen probably contains from 28 to 60 per Cent, of Iron, for the 
portion analysed was found, by digestion in nitric acid, to acquire 8 per cent, in 
weight, probably from the peroxidation of the blue lamina;. 
No. 2 . — No Label with this Specimen. Sp. Gr. 3,081. 
Phenmnena with the Blowpipe . — Becomes magnetic with a metallic tarnish, fuses 
with borax into a clear bottle-green glass. 
Constituent parts. 
Water, 
5,75 
Silex, 
3,20 
Alumine, 
0,40 
Lime, with a trace Mag. 
1,00 
Oxide of Manganese, 
4,00 
Peroxide of Iron, 
85,30 
99,65 
Note . — I refer this specimen to scaly red iron ore, or iron froth of Jameson, 
vol. iii. p. 208. 
No. 3 — No Label with this Specimen. Sp. Gr. 3,400. 
Phenomena with the Blowpipe . — Becomes magnetic, and fuses with borax iuto 
a very dark and somewhat dirty green glass. 
Constituent parts. 
Water, 
6,25 
Silex, 
8,50 
Alumine, 
0,50 
Lime, Phosphate of Iron, 
Trace 
Oxide of Manganese, 
0,0 
Peroxide of Iron, 
84,50 
99,50 
Note . — Ochry red iron ore, or red Ochre of Jameson, vol. iii. p. 210 (?) 
No. 4 .—Mat Chaiti. Sp. Gr. 3,141. 
Phenomena with the Blowpipe . — Becomes magnetic, and acquires the metallic 
tarnish ; with borax on charcoal, fuses into a pitchy slag. 
Constituent parts. 
Water, 
6,00 
Silex, 
4,50 
Alumine, 
1,75 
Carbonate of Lime, 
3,35 
Oxide of Manganese (red). 
16,00 
Peroxide of Iron, 
68,00 
99,60 
Note— The large proportion of Manganese in this specimen is remarkable ; but 
the process used for obtaining it leaves no doubt as to its identity, for the solution 
of muriate of Ammonia will not dissolve oxide of iron. It may be found useful to 
mix with other ores, which may thus afford better steel than they otherwise would. 
See Jameson, vol. iu. p. 232. 
