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"Yogo sapphire" is the preferred term for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. [18] More gem-quality sapphires are produced in Montana than anywhere else in North America. [ 18 ]
Fine blue Yogo sapphires are found at Yogo Gulch west of Lewistown, Montana. [34] A few gem-grade sapphires and rubies have also been found in the area of Franklin, North Carolina . [ 35 ]
The sapphires, called Yogo sapphires as they are mined near Yogo Creek, occur in a formation three miles (4.8 km) long and eight feet (2.4 m) across. [ 1 ] The mountains are named for a butte in the range, Belt Butte, itself named for a band of white rock which encircles it.
Yogo sapphires are a variety of corundum found only in Yogo Gulch, Montana, part of the Little Belt Mountains in Judith Basin County, on land once inhabited by the Piegan Blackfeet people. Yogos are typically cornflower blue in color, a result of their containing trace amounts of iron and titanium .
Sapphires are found along this creek. [2] Notes This page was last edited on 9 January 2021, at 05:03 (UTC). Text is available under the Creative Commons ...
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It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. The only color corundum stone that the term sapphire is not used for is red, which is called a ruby. [1] Pink colored corundum may be either classified as ruby or sapphire depending on locale.
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