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The phrase "a coal" is correct and usable in written English.
It can be used when referring to a single piece or lump of coal, often in contexts related to energy, heating, or mining.
Example: "He placed a coal in the fireplace to start the fire."
Alternatives: "a piece of coal" or "one coal".
Exact(57)
Are you a coal miner?
A coal vault?
A coal port.
Boss was born in a coal mine.
His father was a coal cutter.
His father, Louis, was a coal miner.
Their great-grandfather was a coal miner.
A shepherd followed atop a coal gelding.
Similar(3)
A coal-powered plant?
A coal-fired flying boat?
Getting permission for a coal-fired plant can take years.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com