Author Peter Cristofono ("Rockhounding New England: A Guide to 100 of the Region's Best Rockhounding Sites") will introduce you to the 275 minerals that can be found in Massachusetts and the best places to find them. Specimens of different minerals will be on display, and attendees are encouraged to bring specimens for identification. Peter - who has been an avid field collector of New England minerals, gems and fossils for more than 35 years - has served as president of the Boston Mineral Club and is currently a director of the Micromounters of New England. Q&A and book selling/signing to follow. Sponsored by the Friends of the Library.