Assertion: lignite | /r/Synonym | brown or soft coal
Facets:
Source sentences:
text: The softer and moister lignite (also called brown or soft coal) has a lower calorific value than hard coal and can only be mined in opencast operations.
text: To give a sense of the effects of increasing rank, the following comparison may be used: lignite is soft, dusty, and can ignite spontaneously under the appropriate conditions, whereas anthracite is quite hard, clean to the touch, and must reach a temperature of about 925°F before it will ignite.
text: (Lignite is a soft brown coal formed from compressed peat.
text: There are mainly three types of coal – anthracite, bituminous, and lignite, of which anthracite is the hardest, while lignite is the softest coal.
text: The softer and moister lignite (also called brown or soft coal) has a lower fuel value than hard coal and is not mined below ground but in opencast mines.