If you’ve stumbled across Introduction to Mineralogy—or its Japanese title, Ruri no Hōseki (a.k.a. Ruri Rocks or Ruri’s Jewels)—you might be wondering: is this anime about sparkling gems, quirky high ...

THIS edition of Part 3 of Winchell's “Elements of Optical Mineralogy”, now published separately, entirely supersedes the earlier edition, which was incorporated with Parts 1 and 2 in one volume.

THE first edition of this book appeared in 1902. It was clearly written, admirably illustrated by drawings and photographs, and it soon became a standard text-book on the subject of pure mineralogy.