172 SPECIMENS OF IRON ORE, 



dirty green glass. The blue laminae burn w ith the scintillation peculiar 

 to iron, become porous, and have a metallic tarnish ; they appear to be 

 a deut-oxide of iron. 



When calcined, the pulverised ore, which is of a yellow brown, chang- 

 es to a deep chocolate red ; probably from the privation of the carbonic 

 acid. 



CONSTITUENTS. 



Water and Carbonic Acid, .... 8 50 



Silex, 4 00 



' ' Alumine, ...."^ .... 4 75 



Carbonate of Lime, .... 5 15 



Deut-oxide of Iron, .... 76 00 — 55 Iron. 



, - Oxide Manganese, .... 1 55 



99 95 



NOTE. 



This specimen probably contains from 58 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 laminae. 



No. 2. 



NO LABEL WITH THIS SPECIMEN. 

 Sp. Gr. 3081. 



JBloivpijye — becomes magnetic with a metallic tarnish, fuses wdth 

 borax into a clear bottle-green glass. 



CONSTITUENTS. 



Water, .... .... . , , . 5 75 



Silex, .... .... .... ...... 3 20 



Alumine, .... .... 40 



Lime, with a trace Mag. .... 1 00 



Oxide Manganese, . , . , 4 00 



Peroxide Iron 85 30 — 5950 Iron. 



99 65 



NOTE. 



I refer this specimen to scaly red Iron Ore, or Iron Froth of Jameson, Vol. III. p. 208. 



