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Formula: [Zn8(OH)14(SO4)].3H2O
Hydrated sulphate, namuwite group
Crystal System: Hexagonal
Specific gravity: 3.28 measured, 3.293 calculated for the empirical formula
Hardness: 3
Streak: White
Colour: Light blue
Luminescence: No fluorescence under long wave or short wave UV
Solubility: Dissolves easily in room-temperature dilute hydrochloric acid
Environments
Metamorphic environments
Hydrothermal environments
Hanahanite is a new mineral, approved in 2022.
Localities
The type locality, the Redmond Mine, Waterville Lake, Haywood County, North Carolina, USA, is a very small and
long-inactive lead - zinc mine with a
highly unusual secondary assemblage of
lead - zinc -
copper sulphates, thiosulphates [compounds containing the anion
(S2O3)2-] and carbonates.
Hanahanite and haywoodite were found underground at the mine. The
ore, composed 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. Haywoodite and
hanahanite occur in an unusual, localised,
secondary mineral assemblage in vugs in massive
galena -sphalerite -
chalcopyrite - quartz.
Hanahanite occurs with bechererite,
caledonite, hydrocerussite,
lanarkite and steverustite.
The hanahanite crystals occur as hexagonal prisms with flat terminations up to about 0.3 mm in length, light
blue and transparent with a vitreous lustre and a white streak
(CJMP 61.1137-1149).
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