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What is hardest type of coal?

What is hardest type of coal?
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1 vote
What is hardest type of coal?

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User Abhisekp
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2 Answers

5 votes
Anthracite is the hardest type of coal
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User Superduper
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7.3k points
1 vote
Anthracite is the hardest type of coal.
answered
User MuhammedYunus
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