V.—Tennessee State Geological Survey. Bulletin 16. The Red Iron Ores of East Tennessee. By Ernest F. Burchard. pp. 173, with 17 plates (including 5 maps) and 30 figures in the text. 1913.

1914 ◽  
Vol 1 (5) ◽  
pp. 230-231
Keyword(s):  
Geological Survey ◽  
Iron Ores ◽  
East Tennessee

On the chemical classification of the mica group. I. The acid micas

1925 ◽  
Vol 20 (109) ◽  
pp. 305-318 ◽  
Author(s):  
A. F. Hallimond
Keyword(s):  
General Formula ◽  
Mineral Resources ◽  
Geological Survey ◽  
Iron Ores ◽  
Similar Compound ◽  
Chemical Classification ◽  
Group I

In a discussion of the composition of glauconite, it was shown that the analyses of this substance can be represented in terms of simple molecular proportions, provided that the mineral is regarded as a mixture of a silicate containing the group R2O3 with a similar compound in which one equivalent of R2O8 is replaced with one equivalent of RO; the general formula being R2O. 4(R2O3, RO). 10SiO2. nH2O.Work on the sedimentary iron ores collected during the preparation of the ‘Special Reports on Mineral Resources’, recently issued by the Geological Survey, made it necessary to review the composition of some of the chlorites ; but no evidence of similar replacement was found among the better-known minerals of that group.

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