The colorful story of the Montana mine that produces the prized Yogo sapphires has been updated in this revised edition....
|Title||:||Yogo: The Great American Sapphire|
|Number of Pages||:||219 Pages|
|Status||:||Available For Download|
|Last checked||:||21 Minutes ago!|
Yogo: The Great American Sapphire Reviews
I love this book! As an "under-the-rock" hound (not a geologist `er anything) this combines my love of history & geology. Not many folks know about the American Sapphire, the Yogo. These are great sapphires because they're never heat-treated, the stone's color is always natural & ranges from cornflower to deep blue. Usually small stones. The dike that the sapphires are mined from is interesting because the miners break down the matrix & let the sapphires weather-out. The book has lots of pictures of the Yogo mines in Montana from the end of the nineteenth century through the beginning of the twentieth century.
Yogo: The Great American Sapphire is a great book to have on hand as a reference. A good supplement is the August 2010 copy of Montana magazine which contains a wonderful article about what is going on in yogo country near Utica, Montana. Yogo sapphires are the only sapphires that do not have to undergo a heating process to enhance the beauty of the stone - lovely.
Using this for a research paper in an Appraisal class, always fascinated with colored gemstones. I am a gemologist and retail jewelry is my gig now.