The hardest form of coal is _________________.

Name: The hardest form of coal is _________________.
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Question

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Anthracite is the hardest and highest quality form of coal with the highest carbon content. It has a low moisture and volatile matter content and burns with a clean flame. Lignite is the softest form of coal with the lowest carbon content, while bituminous coal is a mid-grade coal with medium carbon content. Peat is the earliest and least compressed form of coal.

The Hardest Form of Coal Is _________________