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Rhenium has one stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in two other elements (indium and tellurium). Naturally occurring rhenium is only 37.4% 185 Re, and 62.6% 187 Re, which is unstable but has a very long half-life (~10 10 years).
Rhenium was the last element to be discovered having a stable isotope. The existence of a yet undiscovered element at this position in the periodic table had been predicted by Henry Moseley in 1914. In 1925 they reported that they detected the element in platinum ore and in the mineral columbite. They also found rhenium in gadolinite and ...
They also found rhenium in gadolinite and molybdenite. [5] In 1928 they were able to extract 1 gram of the element by processing 660 kg of molybdenite. In 2020 a memorial medal of the discovery was issued by ISTR (art-designer: Igor Petrov).
The Parkin Indian Mound, the type site for the Parkin phase, is the site of another Late Mississippian village located in Parkin, Arkansas, about 30 miles (50 km) southwest of Wilson. In the early 1540s, the Spanish Hernando de Soto Expedition is believed to have visited several sites in the Nodena phase, which is usually identified as the ...
Chile has the world's largest rhenium reserves, part of the copper ore deposits, and was the leading producer as of 2005. [98] It was only recently that the first rhenium mineral was found and described (in 1994), a rhenium sulfide mineral (ReS 2) condensing from a fumarole on Kudriavy volcano, Iturup island, in the Kuril Islands. [99]
Mooney delineated the region as "covering West Kentucky, West Tennessee, part of the Tennessee River Valley in Alabama, the northern half of Mississippi, the Eastern half of Arkansas and southeast Missouri". [3] Southern Illinois (especially Cairo, shown on the map) and Southwestern Indiana are also occasionally included in this region.
It is located in East Tennessee and also extends into southeastern Kentucky, northwestern Georgia, and northern Alabama. This part of Alabama is part of the Black Warrior Basin. [1] The Chattanooga Shale of East Tennessee is reported to be an extension of or correlates with the Marcellus Shale of the Appalachian region to the east. [5]
In Arkansas, the aluminum hydroxides in bauxite form small oolites and pea-sized pisolites and outcrop or are located very close to the surface under thin sediments. The resource was first mined in 1898, 11 years after the State Geologist, John Branner, identified it in a sample from Pulaski County, Arkansas .