The term earth-material genus covers substances whose origin is terrestrial and mineral: soil, sand, stone, gypsum, lime, kohl, and a mineral known as zarnikh.
A wooden object or plant product is not classified as mineral earth merely because it rests on soil. The central disagreement is whether loose dust is necessary, or whether pure earth-based material suffices.
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Tayammum Materials, Intention, Nullifiers, and Searching for Water
The term earth-material genus covers substances whose origin is terrestrial and mineral: soil, sand, stone, gypsum, lime, kohl, and a mineral known as zarnikh.
A wooden object or plant product is not classified as mineral earth merely because it rests on soil. The central disagreement is whether loose dust is necessary, or whether pure earth-based material suffices.