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Octavo Size. VERY GOOD condition. No dustjacket. Dark blue boards with (faded) gilt title to face and spine. Includes 258 photographs. Scarce. This is a really tight and clean copy, free of any names, annotations etc. 220 pages Looks at inclusions and their importance as a means of investigating the genesis and growth of minerals and providing an infallible substantiation of a gem's natural source.