Crystal Chemistry Review
There are a number of good www sources for Mineralogy. I suggest that you spend sometime during the next two weeks checking these out. Spend sometime exploring the links given in a course taught at Albion University
If you are interested in mineral specimens you should check out the Bancroft Mineralogy collection at the University of California at Santa Barbara
You will be expected to be familiar with the properties of the major chemical elements that make up the Earth's crust so a handy reference will be a copy of the Periodic Table
If you were a student at the University of Wisconsin you could enroll in a course in Gemology. However, you can view the home page and associated materials. This is quite well done and may be helpful.
Last but not least, for the serious collector, try Bob's Rock Shop.