The first edition of Deer, Howie & Zussman’s Rock-Forming Minerals was published in 1962 to provide a ‘reference useful to advanced students and research workers in the geological sciences’. That understated expectation has been fully realized in the intervening years. Professor Fleet’s wonderfully comprehensive, revised and updated Volume 3A of the second edition of Rock-Forming Minerals, dealing with the true and brittle micas, was published by the Geological Society of London in 2003. Volume 3B, concerned with the interlayer-deficient micas, is to be published separately. That the second edition of Volume 3 (Sheet Silicates) is split into...

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