Navigating my 10-year-old’s sudden obsession with collecting random rocks during family outings

Lately, my 10-year-old has become obsessed with picking up all sorts of rocks whenever we go anywhere outdoors - parks, hiking trails, even just a quick walk around the neighborhood. At first, it seemed harmless and kinda cute, but now the collection has grown so big that it’s taking over a corner of our living room. I’ve tried setting limits on how many rocks she can keep each time, but she gets really upset if I throw any away or suggest donating some. I want to encourage her curiosity and love for nature, but I’m struggling with the clutter and how to teach her about boundaries without squashing her enthusiasm. We don’t have a lot of extra storage space, so I’m looking for creative ways to display or store her collection that feel special to her but also manageable for us. Has anyone else dealt with a sudden collecting phase like this? How did you balance supporting their interests while keeping your home organized? Also, have you found any fun projects or learning activities that helped channel a rock obsession into something a bit more contained?