The Office of the Supreme Leader

Doing tayammum on the baked rock, gypsum or limestone

Q: What is the ruling of doing tayammum on gypsum, limestone, their baked pieces and bricks?
A: Doing tayammum on anything that is considered as the earth — like gypsum, limestone, etc. — is valid and it is not remote that doing it over baked gypsum and limestone, and bricks is also correct.
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