That kinda depends on what you want to learn about stones. 
I'm a rockhound from way back -- childhood rock collections and all -- and a huge fan of crystals and gemstones of all kinds. My undergrad degree was in geology/earth science, so I tend to think about physical properties before I get to METAphysical properties. bulk crystals wholesale :p
One of the most important things to understand about using any kind of rocks in a metaphysical way is that the same kind of rock can affect different people in different ways. Even different specimens of the same kind of rock can affect the same person differently. So it's HIGHLY individual and subjective.
I have several books on the metaphysical properties of rocks and I'm familiar with many similar websites, and one of the most striking things is how much disagreement there is between authors. There are some very basic points of agreement (amethyst is good for healing, citrine is good for drawing wealth), but far more points that vary widely from book to book.
I'm not saying the books can't be useful. But you really have to experiment to find out what does and doesn't work for you. If you can find a book whose author has similar reactions to yours, it can be helpful.
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