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Yogo sapphire
Compilation of Reported Sapphire Occurrences in Montana
In Montana's Gravel Bars; Diamond Once Found in Pioneer Gulch
19, 2017 Namibia IGC 2017 N Amibia 35 TH IG C 2017 INTERNATIONAL GEMMOLOGICAL CONFERENCE NAMIBIA October 8 - 19, 2017 Namibia
Montana Fall Gatherin' Auction
Winter 2009 Gems & Gemology
Gulfport Gems
Fall 1991 Gems & Gemology
Spring 1999 Gems & Gemology
Abandoned-Inactive Mines on Lewis and Clark National Forest-Administered Land
Gemstones Web.Indd
Volume 20 / No. 7-8 / 1987
^Ejournal of Gemmology
GEM LOCALITIES of the 1980S
Gemological Characterization of Sapphires from Yogo Gulch, Montana
The Yogo Sapphire Deposit Developed in 1987 (Mychalulz, 1992)
A Common Origin for Thai/Cambodian Rubies and Blue and Violet
Northwest Newsletter Vol 49 No
Corundum Deposits of Montana
Top View
The Journal of Gemmology
Montana a Guide to the Museums and National Historic Sites with French Interpretation
Bulletin 118
THE ROLE of SILICON in the COLOR of GEM CORUNDUM John L
Fall 1985 Gems & Gemology
February 2021 February 2021 Hgms Mineral Society 1
Geological Survey
July 2017 Bulletin of the New York Mineralogical Club, Inc
Yogo Sapphire
Montana Bureau of Mines and Geology 406-657-2938 Introduction Yogo District the fi Rst Reported Discovery of Sapphires in the U.S
Minutes of the Meeting Business & Industry
Industrial Minerals in Montana
Volume 22 / No. 8 / 1991
Winter 1995 Gems & Gemology