Lucky Seashell Approx. 10cm x 8cm

This item has been in my family for a long time, and I'm listing it because my great-grandmother, the previous owner, has passed away.

It used to be kept in the bedroom. A friend who suffered from sleep paralysis every night stayed over and slept here, and their sleep paralysis disappeared.
I also took it to a shrine, and apparently it's quite powerful.
It seems to bring good luck with money too.
It's a little eerie, so I'd like to sell it quickly...

- Material: ???
- Appearance: Natural colors and patterns
- Size: Approx. 10cm x 8cm

Thank you for looking.