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Coal is actually split into four types
- Lignite
- Subbituminous
- Bituminous
- Anthracite
And there is also Graphite which is technically different from coal.
32 0 ReplyThere is also diamond which is technically different than coal.
5 0 ReplyFullerenes, nanotubes, graphene... they're also different.
For illustration purposes, C60 fullerite:
4 0 ReplyWow there’s a lot going on in there. I don’t think I’ve ever seen a fullerite
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