Tag: gemstones

Wyoming – The Gemstone State.

Gem-quality pyrope garnet faceted from rough collected at ButcherknifeDraw near Green River, Wyoming. Colored gemstones were almost unheard of in Wyoming prior to 1977 other than some fabulous cobbles and boulders of jade, some petrified wood, a few agates and a couple of tiny diamonds that required a microscope to see. After I was hired

Geology of Gemstone Deposits

Large chlorite pseudomorph after garnet found in the Sierra Madre Mountains, Wyoming. The chlorite slowly replacedthe garnet and accepted the garnet’s crystal form.  Much of Wyoming is underlain by Archean cratonic basement rocks and cratonized Proterozoic rocks that provide favorable geological environments for a variety of gemstones – notably diamond, iolite, ruby, sapphire, garnet, kyanite,


During 30 years at the WGS, I found hundreds of deposits. How did I do this? I used geology as a guide; I looked at things differently and was motivated to look and search for mineral deposits. While conducting reconnaissance, I discovered jasper in several old mines at Tin Cup, in an outcrop near the


A 16-carat iolite from Palmer Canyon, Wyoming. I discovered iolite (water sapphire) at Palmer Canyon in 1995. The iolite occurred with gem-quality kyanite in mica schist & gneiss adjacent to vermiculite that had enough silica to form these gems. I couldn’t believe the amount, size & beauty of the stones. The single, largest, iolite gemstone


In 1997, I decided to search the Leucite Hills in western Wyoming for diamonds (see photo at left). I didn’t find diamonds, but mark my words – “DIAMONDS WILL BE FOUND HERE”. This is an easy prediction to make based on geology. The Leucite Hills consist of several lamproite volcanoes & flows that erupted 900,000


A good understanding of geology, persistence & some luck can lead to incredible treasures. In 1977, I started work as a research geologist at the Wyoming Geological Survey in Laramie. Next to nothing was known about gemstones in the state, but over the years, I tracked down many mineral deposits & found some of the

Major Diamond and Colored Gemstone Deposits Found in US

MAJOR DIAMOND PROVINCE DISCOVEREDsee GEMHUNTER See also State Line Kimberlite Province showing locations of (1) Radichal kimberlite &Mineral Indicator Anomalies, (2) the Iron Mountain kimberlite district, (3) Schaffer, Aultman, Ferris kimberlites, (4) Keslsey Lake Kimberlites (5) Nix kimberlites, (6)Sloan kimberlites, (7) Estes park kimberlites, (8) Boulder Kimberlite, (9) Boden diamond placer. In between these are