Reference Books
These are great books to have on hand as your family studies geology.
National Audubon Society Field Guide to Rocks and Minerals: North America
Gemstones of the World: Newly Revised Fifth Edition by Walter Schumann
These are great books to have on hand as your family studies geology.
National Audubon Society Field Guide to Rocks and Minerals: North America
Gemstones of the World: Newly Revised Fifth Edition by Walter Schumann