Wyoming Gemstones

Roadside Geology of Wyoming (Roadside Geology Series) - by David D. Alt, Donald W. Hyndman
Wyoming Geology book -- There are no better books for roadside geologizing than the Roadside Geology series.
Yellowstone Ecology: A Road Guide - by Sharon Eversman, Mary Carr (Contributor), David Alt (Editor)
A guide to what can be seen from a car passing through Yellowstone and Grand Teton national parks and adjacent regions of Wyoming, Montana, and Idaho.
Gemstone Related:
Field Collecting Gemstones and Minerals - by John Sinkankas
Probably the best general description written for the layperson about how, where, and why gem and mineral deposits form.
Gemstones (Eyewitness Handbooks) - by Cally Hall, Harry Taylor (Photographer)
A field guide to gemstones. Nice pictures and good, brief, well-written descriptions of over 130 varieties of gemstones.
The Curious Lore of Precious Stones - by George Frederick Kunz
The definitive book on fascinating, traditional gem lore. Very practical.
Gem Identification Made Easy: A Hands-On Guide to More Confident Buying & Selling New 2nd Edition - by Antoinette L. Matlins & Antonio C. Bonanno
This book is really great for knowing he latest gems, synthetics, treatments, and instruments. Easy to use.
Gemstone Buying Guide: A Guide to Buying - by Renee Newman
Very nice gemstone identification book.
Simon and Schuster's Guide to Gems and Precious Stones - by C. Ciprianai, Kennie Lyman (Editor), Alessando Borelli
This book is one inch thick and every facing page has a full colored photo of gems or precious stones. Hardness, weights, cuts, refractions, and value of color are given for each gem.
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Wyoming State Information