Lignite is the softest form of coal.
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
lignite
lignite
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
Lignite
lignite
lignite
lignite
diamond is the hardest and graphite is the softest
Lignite The softest of this family is not much more concentrated than peat and has about 4000btu/lb.
diamond
Another name for bituminous coal is soft coal.
The softest not exactly the charcoal cat is the softest 2 me ~Puplove56