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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] Montana sapphires come in a variety of colors, though rubies are rare. [16] [18] [23]
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.
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
Dry Cottonwood Creek is a creek in Deer Lodge County, Montana. Approximately 10 miles (16 km) long, it flows northwest out of the southern reaches of the Boulder Mountains into the Clark Fork river near Deer Lodge, Montana. Sapphires are found along this creek. [2]
A total of 6,974 metres of diamond drilling was completed in 65 holes. Ruby and pink sapphire was found in 48 of the holes. At Aappaluttoq, the ruby and pink sapphire mineralization occurs in a corundum (ruby-sapphire) alteration band that exhibits trench-to-trench and drill hole-to-drill hole continuity.
Rich Gulch (formerly, Pleasant Springs [2]) is an unincorporated community in Calaveras County, California, 5 miles (8.0 km) east-northeast of Mokelumne Hill. [2] It lies at an elevation of 1903 feet (580 m).
Helenite set in an earring. Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone.
In 1906 the state mineralogist of California reported on 52 granite quarrying areas in 17 counties. [2] Many quarries were opened temporarily to provide stone for one or a few local or regional construction projects, but could not compete later when railroads allowed for economical transportation of heavy building materials to the area.
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