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What are the materials used for tayammum? Some days I use powder instead of earth, is that valid?
Only certain materials may be used for tayammum.
These materials are such that when burned, they don't produce ashes.
The easiest thing would probably be to use a rock.
I disagree with the viewpoint of using walls unless the wall is made of brick in which case it is similar to using a stone.
Required, but never shown