Topaz Crystal Models
thingiverse
Here is a model of a "real" Topaz crystal. It is based on a crystal measured and drawn by AEH Tutton and shown in his textbook - "Crystallography and Practical Crystal Measurement", AEH Tutton, Macmillan and Co. Ltd, London, 1922, p 231. https://books.google.com/books?id=QWpUAAAAMAAJ& A second model, idealized to show most faces observed for Topaz, is included. Instructions Some of the interfacial angles for the "real" crystal can checked against the values given in Tutton's book using a carpenters protractor.
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