What are /r/RockCollection's favorite Products & Services?

From 3.5 billion Reddit comments

Try going to a local book store and look for books on rocks, minerals, fossils, and elements. Look throught the book(s) and see if any of the rocks match up with the ones in your collection. I'd recommend the book, Rocks and Minerals: The World In your hands. for basic cataloging (this book is mostly for casual collectors and may not include all of your rocks). But you could also find region specific books (if you found some of those rocks your self.), Or field guides. If you have a local rock mine, such as the Herkimer Diamond Mines you could probably get an ID there from an employee.