Here's a quiz to test your powers of mineralogical observation. Send your answers to "Read the Rocks," Harvard Magazine, 7 Ware Street, Cambridge, Massachusetts 02138. Or submit them via this webpage by November 20. The answers will appear in the January-February issue. From among the correct submissions, the editors will randomly select one winner to receive a copy of senior editor John T. Bethell's forthcoming book, Harvard Observed (which will be published next year during this magazine's centennial celebration), and a walking tour of the campus guided by author David Williams (transportation to Cambridge not included).
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