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Formula: [Pb
Sulphate. thiosulphate, paramorph of
cubothioplumbite
Crystal System: Hexagonal
Specific gravity: 5.531 calculated for the empirical formula, 5.552 calculated for the ideal formula
Hardness: 2½
Streak: White
Colour: Colourless
Luminescence: The mineral does not fluoresce under long wave or shortwave UV
Solubility: Slowly dissolves in room-temperature dilute hydrochloric acid
Environments
Hexathioplumbite is a new mineral, approved in 2021 and to date (August 2023) reported only from the type
locality.
Localities
At the type locality, the Redmond mine, Waterville Lake, Haywood county, North Carolina, USA, hexathioplumbite
and cubothioplumbite were found underground. The ore, consisting
mainly of galena and sphalerite
with lesser chalcopyrite, occurs in an epithermal vein system consisting
of disconnected sulphide-bearing quartz lenses near the contact between a
granite gneiss and a
mica schist.
Cubothioplumbite and hexathioplumbite occur together in a
localised, unusual secondary mineral assemblage in vugs in
massive galena - sphalerite -
chalcopyrite - quartz in close
association with anglesite,
cerussite, fassinaite,
hydroredmondite, lanarkite
and steverustite.
Crystals of hexathioplumbite occur as colourless, transparent, hexagonal prisms up to about 1 mm in length.
Twinning is observed, the streak is white and the lustre is adamantine
(CJMP 61.623-633).
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