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Cryptocrystalline silica. Mohs scale hardness. 6.5–7. Luster. Waxy. The Fairburn Agate is a type of gemstone found in the agate beds of Southwestern South Dakota and Northwestern Nebraska. It is also the state gemstone of South Dakota. [1] Fairburns are characterized from other types of agate by their colors and the shape of the bands. [1][2]
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 ...
Sioux Quartzite at Falls Park, Sioux Falls, South Dakota Cross-bedding in the Sioux Quartzite, Blue Mounds State Park, Minnesota, United States.. The Sioux Quartzite is a Proterozoic quartzite that is found in the region around the intersection of Minnesota, South Dakota, and Iowa, and correlates with other rock units throughout the upper midwestern and southwestern United States.
This is a list of the official state symbols of the U.S. state of South Dakota. [1] [2] ... Gemstone: Fairburn agate: 1966 [3] Soil: Houdek loam: 1990 Culture. Type ...
Pegmatite. A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite.
Black Hills gold jewelry is a type of jewelry manufactured in the Black Hills of South Dakota. It was first created in the 1870s during the Black Hills Gold Rush by a French goldsmith named Henri LeBeau, who is said to have dreamed about the design after passing out from thirst and starvation. Black Hills gold jewelry depicts leaves, grape ...
It was designated the official gemstone of Lethbridge, Alberta, Canada in 2007, [2][3] and was subsequently designated as Alberta's official gemstone in April 2022. [4] Ammolite is also known as aapoak (Kainah for "small, crawling stone"), gem ammonite, calcentine, and korite. The latter is a trade name given to the gemstone by the Alberta ...
Dozens of mammoths were trapped in a South Dakota sinkhole over 100,000 years ago. A bulldozer uncovered the first fossil 50 years ago, and experts have been finding bones ever since. The Mammoth ...
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