My kids 7, 10, 13 are reading through these on their own with discussion . This is sort of an on the side set of books for us, not an official study.
Rocks and Minerals by Lou Williams Page
How to Dig to the Other Side of the World by Faith McNulty
If You Find a Rock by Peggy Christian
Millions and Millions of Crystals by Roma Gans
Cracking Up: A Story About Erosion by Jacqui Bailey
The Rock Factory: A Story About the Rock Cycle by Jacqui Bailey
Rocks: Hard, Soft, Smooth, and Rough by Natalie M. Rosinsky
Rocks In His Heady by Carol Otis Hurst
Let’s Go Rock Collecting by Roma Gans
Dirt by Steve Tomecek
Planet Earth/Inside Out by Gail Gibbons
Geology Rocks! Hands-On Activities by Cindy Blobaum
REFERENCE – DK Rocks and Minerals