Instruct: Classify an Amazon review as either positive or negative.
Query: Encyclopedia of Rocks and Minerals, a Review

I am the author of two books, "Collecting Fluorescent Minerals" and "The World of Fluorescent Minerals" and needed additional resources for non-fluorescent minerals. This book was nicely done - good illustrations, lots of variety, clearly written - but the information covering fluorescent minerals in this book was not very accurate. Every mineral collector needs several sources to get a good idea of what he or she has and this is one that I will continue to use. This should not be your only book, but it is worth having among your library.