The reports from Abu Yusuf are not uniform on sand. The principal statement here permits soil and sand, but other transmissions restrict the materials even further.
The precise distinction matters: the general earth-material principle of Abu Hanifa and Muhammad is broader than either of those reported restrictions.
Opening interactive controls...
Tayammum Materials, Intention, Nullifiers, and Searching for Water
The reports from Abu Yusuf are not uniform on sand. The principal statement here permits soil and sand, but other transmissions restrict the materials even further.
The precise distinction matters: the general earth-material principle of Abu Hanifa and Muhammad is broader than either of those reported restrictions.