Stones once thought to confer the power of invisibility

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Possible Answers: CHAR.

Last seen on: The Chronicle of Higher Education Crossword – Sep 8 2017

Random information on the term “CHAR”:

Char is the solid material that remains after light gases (e.g. coal gas) and tar have been driven out or released from a carbonaceous material during the initial stage of combustion, which is known as carbonization, charring, devolatilization or pyrolysis.

Further stages of efficient combustion (with or without char deposits) are known as gasification reactions, ending quickly when the reversible gas phase of the water gas shift reaction is reached.

CHAR on Wikipedia