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One of the two mineral sources of fuel, lignite is found in veins in sedimentary layers. When processed at a smelter or magma smelter, one unit of lignite produces 5 units of coke. If done at a regular smelter, this processing requires one pre-existing unit of fuel (either charcoal or coke), leaving a net production of 4 fuel.
Lignite is flammable - if exposed to fire or magma, an item made of lignite will burn for the better part of a year before wearing away. Exposure to water (including rain) will extinguish it, unless it happens to be stored in a bin.
It otherwise behaves as an ordinary stone. If you don't need to produce coke, you can use it to produce goods with a mason or stonecrafter. By default, lignite is considered an economic stone and it will be reserved for coke production unless changed in the Stone submenu.
 See also
[INORGANIC:LIGNITE] [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE] [STATE_NAME_ADJ:ALL_SOLID:lignite][DISPLAY_COLOR:0:7:1][TILE:'*'] [ENVIRONMENT:SEDIMENTARY:VEIN:100] [SPEC_HEAT:409] [IGNITE_POINT:11440] [MELTING_POINT:NONE] [BOILING_POINT:16708] [SOLID_DENSITY:1250] Should be less dense than bituminous coal. [IS_STONE]