SISSVoc Default

lignite

http://resource.geosciml.org/classifier/cgi/lithology/lignite

alt label
low rank coal more like this
definition 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. more like this
example
brown coal more like this
metalignite more like this
ortholignite more like this
sub bituminous coal more like this
source Economic commission for Europe, committee on Sustainable Energy- United Nations (ECE-UN), 1998, International Classification of in-Seam Coals: Energy 19, 41 pp. more like this
type
Resource original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/lithology/coal original
narrower lignite original
in scheme simplelithology original
is primary topic of lignite