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Formula: KAl0.33W2.67O9
Oxide, tungsten-bearing mineral
Crystal System: Hexagonal
Specific gravity: 6.52 calculated
Hardness: 5 to 6
Streak: White
Colour: Light green
Environments
Plutonic igneous environments
Hydrothermal environments
Wumuite is a relatively new mineral, approved in 2018 and to date (March 2023) reported only from the type
locality.
Localities
At the type locality, Nanyang, Huaping County, Lijiang, Yunnan, China, wumuite was found in
biotite–quartz
monzonite as light green hexagonal tabular crystals, up to 0.3 mm in
diameter. Associated minerals include quartz,
orthoclase, albite,
biotite, hornblende,
kaolinite, ilmenite,
goethite, hematite,
zircon, zoisite,
tourmaline, monazite-(Ce),
allanite-(Ce), scheelite,
tellurite and tewite.
The formation of wumuite is likely related to the nearby quartz-vein-type
gold mineralisation; it was formed by the metasomatic reaction between
tungsten-rich hydrothermal fluids and the
K-feldspar in the
monzonite
(EJM 32.483–494).
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