Presentation Information
[R1-P-17]Natalyite and Vésigniéite from the Yamato mine, Kagoshima prefecture, Japan
*Takefumi NIWA1, Daisuke Nishio-Hamane2 (1. Min. Soc. Nagoya, 2. ISSP, Univ. of Tokyo)
Keywords:
Natalyite,Vésigniéite,Yamato mine
Natalyite occurs as crystals up to 1 mm in diameter, associated with quartz, poppiite, and other minerals in goldmanite-rich masses, or in dark green veins composed mainly of poppiite with vanadium-bearing magnesio-riebeckite. The chemical composition determined by EDS yielded the empirical formula (Na0.92Ca0.05)(V1.01Mn0.03)Si1.98O6 (n=4), which is extremely close to the end-member composition. X-ray diffraction (XRD) analysis shows good agreement with previously reported data.
Vésigniéite is found in fractures within host rocks dominated by carbonate minerals, including chalcocite, and is occasionally accompanied by malachite. It forms film-like aggregates up to 1 mm across. Raman spectroscopic analysis is in good agreement with the RRUFF database (ID: R120149). EDS yielded the empirical formula Cu2.92Ba0.87Ca0.12(V2.00Si0.08O4)2(OH)2.01 (n=5). X-ray diffraction analysis has not yet been conducted due to the limited amount of available sample material.
Vésigniéite is found in fractures within host rocks dominated by carbonate minerals, including chalcocite, and is occasionally accompanied by malachite. It forms film-like aggregates up to 1 mm across. Raman spectroscopic analysis is in good agreement with the RRUFF database (ID: R120149). EDS yielded the empirical formula Cu2.92Ba0.87Ca0.12(V2.00Si0.08O4)2(OH)2.01 (n=5). X-ray diffraction analysis has not yet been conducted due to the limited amount of available sample material.
