LIGNITE COAL
Lignite coal is a low rank coal that is basically a compacted, slightly lithified
peat. Lignite coals are soft, fragile, brown to black in color, and dull
in luster. Many lignites are called “brown coals”.
Lignites can spontaneously combust. Sometimes lightning strikes and
wildfires ignite lignite coal beds Clinker
beds are the burned-out remains of lignite beds. Lignite coals and clinker beds are
somewhat common in parts of northeastern Wyoming, eastern Montana, and western
North Dakota.
Lignite coal (4.5 cm across)