Anyone know what this is hanging in the attic

Anyone know what these bags are that are hanging like “potpourri” in the attic. There were three of these hanging near the access. Mesh bags containing what looks and feels like coral (some type of desiccant?) No lable. DSCN1057 DSCN1060

Volcanic/mineral rock, odor & moisture absorbent…

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Thank you Dominic, I appreciate it. That would make sense since they also installed an attic fan. It is located in an isolated section over the master bedroom and bath. Did not see any evidence of mold or other issues in the attic. I will advise the client to check disclosures and or get info from the seller about any previous issues with moisture or roof leakage in this section of the attic.

You would probably know by the smell if it was moth balls.