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Zemannite
Zemannite is a very rare oxide mineral with the chemical formula Mg0.5ZnFe3+()3·4.5H2O. It crystallizes in the hexagonal crystal system and forms small prismatic brown crystals. Because of the rarity and small crystal size, zemannite has no applications and serves as a collector's item.
==History and etymology==
Zemannite was discovered in 1961 in a tellurium deposit near Moctezuma, Sonora, Mexico as an unnamed new mineral. It was not accepted then by the International Mineralogical Association (IMA) due to the uncertainty in its chemical composition.〔
The mineral structure was solved in 1967 by Eckhart Matzat as (Na,H)2(Zn,Fe)3+(Mn,Mg)2()3·nH2O is specified.〔E. Matzat: ''Die Kristallstruktur eines unbenannten zeolithartigen Tellurminerals, (Zn,Fe)2()3}NaxH2−x • n H2O''. In: ''Tschermaks Mineralogische und Petrologische Mitteilungen''. Nr. XII, 1967, S. 108–117.〕 Two years later, the mineral was recognized by the IMA under the name zemannite, in honor of the Austrian mineralogist Josef Zemann (born 1923), who had worked extensively on tellurium minerals.〔〔E. Matzat, SJ Wiliams (''Zemannite, a new tellurite mineral from Moctezuma, Sonora, Mexico'' ), Canadian Mineralogist Vol. 10, 1969, pp. 139–140.〕
Later investigations showed that zemannite, as well as the related mineral kinichilit, often contains impurities of sodium and magnesium and thus the formula was refined to its current form, Mg0.5ZnFe3+()3·4.5H2O.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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