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Sudoite

Sudoite is a mineral from the chlorite group. It was named after Toshio Sudo (1911–2000), professor of mineralogy at the University of Tokyo, in Japan, and a pioneer of clay science. The mineral tosudite also bears his name. It was approved as a valid species by the International Mineralogical Association in 1966.

Characteristics
Sudoite is a clay mineral with chemical formula defined as Mg2Al3(Si3Al)O10(OH)8. It has a monoclinic crystal system. Its hardness on the Mohs scale is between 2.5 and 3.5. ==Classification==
Classification
Following the Nickel–Strunz classification, it is contained in the "09.EC.55" group: == Formation ==
Formation
It has been first discovered in the Knollenberg Keuper formation, in the village of Plochingen, Stuttgart Region (Baden-Württemberg, Germany). Despite being an unlikely mineral, it has been described in every continent but Antarctica and Oceania. It is found mainly in hydrothermal or high-pressure/low-temperature (HP/LT) metamorphism contexts == Use ==
Use
This mineral has been used as gemstone for the production of personal ornaments, beads and pendants, during the Early Ceramic Age (500 BC – 500 AD), in the Lesser Antilles. The precise source of such formation of sudoite allowing to carve artifacts in rather large blocks remain unknown. == References ==
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