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| Mineralogical Characteristics and Genesis of New Mineral Tewite |
| LI Guo-wu, XUE Yuan, XIE Ying-mei |
| China University of Geosciences(Beijing) laboratory of crystal structure, Beijing 100083, China |
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Abstract Tewite is a new mineral that discovered in the Panzhihua-Xichang region in 2014. It is associated with scheelite, tellurite and two of unnamed new minerals with compositions of KW2.27Al0.33O9(submitted to IMA-CNMNC as 2017-067a) and WO3, respectively. How this mineral association was formed is a matter of concern. In this study, we explored the origin of tewite by field investigation, crystal chemistry (Electron probe, infrared spectrum, X-ray powder-diffraction), and synthetic method. Although tewite occurred in Neoproterozoic monzonite, such unique mineral is not likely to result from crystallization from Neoproterozoic medium-felsic magma but was formed in the vein-type gold mineralization related to Permian mafic magmatism. Te is highly enriched in volcanism/magmatism-related hydrothermal fluids that is Te-W-rich. Such fluids reacted with potassium feldspar in the monzonite following the process of KAlSi3O8+TeO2+WO3K2Te2W5O19+SiO2, resulting in the formation of tewite. This reaction has been proved by our synthetic experiment. Finnally, tewite filled the fractures in monzonite after alteration.
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