Hydroplumboelsmoreite

hydroplumboelsmoreite

covellite

raspite

bismutite

Images

Formula: (Pb☐)(W1.33Fe3+0.67)O6(H2O)
Anhydrous tungstate
Specific gravity: 6.04 measured, 7.47 calculated
Hardness: 4½ to 5
Streak: white, yellow
Colour: Red to brownish red, also yellow and colourless
Solubility: Soluble in hot, concentrated H3PO4, but not in other mineral acids
Magnetism: Weakly magnetic
Environments

Hydrothermal environments

The mineral was originally named 'jixianite', and renamed hydroplumboelsmoreite in 2021.

Localities

At the type locality, the Yanhe Mine, Ji county, Tianjin, China, hydroplumboelsmoreite (initially named jixianite) was discovered in the oxidised section of a high-temperature hydrothermal tungsten-bearing lead-quartz vein-type deposit. The tungsten mineralisation was related closely to magmatic activity and occurs in the inner contact zone of the rock. The metallogenic rock is mainly intermediate-felsic rock, and the ore-bearing surrounding rocks are quartz monzonite and medium to fine grained granite. The primary minerals in the oxidised zone include quartz, pyrite, ferberite, cassiterite, chalcopyrite, scheelite, acanthite, silver and copper. The secondary minerals found nearby include muscovite, bismutite, raspite, wulfenite, malachite, covellite, hydroplumboelsmoreite, and a potentially new mineral with the suggested name of 'hydroelsmoreite'.
Hydroplumboelsmoreite is an uncommon mineral mostly occurring as microcrystalline to cryptocrystalline aggregates, with an earthy, honeycombed, or crusty appearance, and the rare single crystals are tiny, about 160 microns, exhibiting the characteristics of a hypogene mineral. It is commonly intergrown with raspite and ‘hydroelsmoreite’, and may be formed as a secondary mineral after scheelite, ferberite and wulfenite (MM 85.6.890-900, AM 64.1330 (as jixianite)).

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