Lignite is the youngest and softest coal; bituminous is mid-grade coal, and anthracite is the hardest and hottest burning coal. Even brown coal.
Lignite
lignite
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Lignite is the softest form of coal.
Lignite
Lignite
lignite
lignite
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Lignite is the softest form of coal.
lignite
that'll be lignite trust me
Lignite The softest of this family is not much more concentrated than peat and has about 4000btu/lb.
The softest not exactly the charcoal cat is the softest 2 me ~Puplove56
Bass trees are the softest
The mantle is the softest layer of the Earth.