Meta-anthracite

George Kapo. What percentage of the carbon in meta-anthracite coal do you think is in the platelets (800-1000 A.) you observed ... 

Mr. McCartney. From a study of electron micrographs, we estimate that a very large proportion of the apparent vitrain band in this meta-anthracite consists of graphite crystallites or platelets. The intensity and sharpness of graphite peaks in diffraction patterns supports this view. 

The meta-anthracite sample behaved in a completely different way compared with the rest of the coals. It had a negligible capacity for argon consequently, diffusion measurements could not be made. Helium, even at 250°C., could not enter into its micropores. Helium was shown to be able to pene-... 

The critical dimension of the micropores in anthracite is large compared with that in coking bituminous coal, but when the meta-anthracite region is reached the microporosity disappears. 

High-rank coal Refers to anthracite, meta-anthracite, and bituminous coals, which are relatively low in moisture, high in combustible carbon, and have high heat contents (compare low-rank coal, lignite, and subbituminous coal). 

Meta-anthracite A term used by some geologists to refer to highly metamorphosed anthracites. Metabolism A biochemical process that alters the structure of a chemical. 

Anthracitic class class of rank consisting of semianthracite, anthracite, and meta-anthracite. 

Anthracitic Meta-anthracite Anthracite Semi anthracite ... 

Maigre Anthrazit Anthracite Antraciti special Anthraciet Meta-antracyt Anthracite Meta-anthracite... 

Anthracite is the highest rank of coal and has a carbon content of over 87% on a dry ash-free basis. Anthracite coal generally has the highest heating value per ton on a mineral matter-free basis. It is often subdivided into semianthracite, anthracite, and meta-anthracite on the basis of carbon content. Anthracite is often referred to as hard coal but this is a Layman s term and has little to do with the hardness of the coal. 

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