Lignite
Asia-Pacific Economic Cooperation (APEC)

European Commission - Eurostat
Lignite and derivatives comprise lignite, brown coal coke, brown coal briquettes, peat and peat briquettes. This coal has a gross calorific value of less than 17 435 kJ/kg (4 165 kcal/kg) and contains volatile matter greater than 31% on a dry mineral free basis. Oil shale and tar sands produced and combusted directly are also covered here.

International Energy Agency (IEA)
Non-agglomerating coal with a gross calorific value less than 17 435 kJ/kg (4 165 kcal/kg) and greater than 31% volatile matter on a dry mineral matter free basis.

United Nations Economic Commission for Europe (UNECE)
Non-agglomerating coal with a gross calorific value less than 17 435 kJ/kg (4 165 kcal/kg) and greater than 31% volatile matter on a dry mineral matter free basis.

UNSD Energy Statistics Section
Non-agglomerating coals with a gross calorific value elss than 17,435 KJ/kg (4,165 kcal/kg) and greater than 31 per cent volatile matter on a dry mineral matter free basis.