My series of rock and mineral field identification guides, produced with Bob Lynch, encompasses the majority of the books I write. Each focuses on a specific state or region and teaches readers what rocks and minerals are found there as well as some of the science behind their formation. Where my guides differ from others, however, is that all manner of material is covered, from highly collectible minerals to the most mundane rocks. And each rock or mineral presented is discussed with informative, descriptive language that relays the key identifying traits to the reader without the need for needlessly technical definitions or, on the other hand, being "dumbed down." The specimens photographed are not once-in-a-lifetime, museum-grade samples, but rather are average specimens of the quality and size that amateur collectors can expect to obtain themselves. The reception to this approach has been overwhelmingly positive.
At the time of writing, I've written 11 field guides, with my latest, New York Rocks & Minerals, due for release in early 2016. The photos here show my personal copies, many of which had ridden around in my backpack for months at a time.
All of my books are published by Adventure Publications/AdventureKEEN, 2008-2016.