A problem is: a stone is composed of various size pebbles, some of which are similar to grains of sand. Some of them might be grains of sand.
One way to resolve this: a particle of powder might be composed of collections of atoms, resembling pebbles, in a matrix of atoms, equivalent to a sandy cement holding the pebbles together in a stone.
The alternative (not necessarily exclusive) is large atoms in a matrix of smaller atoms.
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