The definitive guide to rocks and minerals, completely updated for the fifth edition, includes 385 color photographs showing rocks, minerals, and geologic formations. Hundreds of minerals are described, with details such as geographic formations. Hundreds of minerals are described, with details such as geographic distribution, physical properties, chemical composition, and crystalline structures.
This is probably better than the three star rating I gave, but the illustrations are either black and white or somehow lacking for identification purposes, in my opinion. There's a lot of geology chemistry, and that interests me. Maybe later editions have better illustrations of rocks, or clearly define them. Compared to other field guides I have seen, I would consider this fair to middling.