Item talk:Q41372: Difference between revisions

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= Mindat Description =
= Mindat Short Description =
A consolidated, dull, soft brown to black coal with visible plant fragments set in a finer grained matrix
 
= Geoscience Ontology Description =
A consolidated, dull, soft brown to black coal with visible plant fragments set in a finer grained matrix. 60-75% carbon content dry ash free, 46-63% volatiles.
Coal that has a gross calorific value less than 24 MJ/kg (determined in conformance with ISO 1928), and vitrinite mean random reflectance less than 0.6% (determined in conformance with ISO 7404-5). Gross calorific value is recalculated to a moist, ash free basis using bed moisture (determined according to ISO 1015 or ISO 5068). Includes all low-rank coals, including sub-bitiminous coal. A consolidated, dull, soft brown to black coal having many readily discernible plant fragments set in a finer grained organic matrix. Tends to crack and fall apart on drying. Operationally sub-bituminous and bitiminous coal are qualitatively distinguished based on brown streak for sub-bitiminous coal and black streak for bituminous coal.
 
A carbon-poor and humidity-rich variety of coal which retains the structure of the origi...

Latest revision as of 21:52, 9 November 2023

Mindat Short Description

A consolidated, dull, soft brown to black coal with visible plant fragments set in a finer grained matrix. 60-75% carbon content dry ash free, 46-63% volatiles.

A carbon-poor and humidity-rich variety of coal which retains the structure of the origi...

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