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Formula: (Ni1-xFe3+x)(SO4)x/2(OH)2.nH2O (x < 0.5, n < 3x/2)
Hydrated sulphate containing hydroxyl, glaucocerinite group
Crystal System: Hexagonal
Specific gravity: 2.96 calculated
Streak: Yellow-white
Colour: Yellow
Solubility: Soluble in dilute acids
Environments
Hydrohonessite may convert readily into honessite, depending on
humidity and temperature
(Mindat).
Localities
At the type locality, the Otter Shoot Nickel Mine, Juan complex, Kambalda Nickel mines, Kambalda, Coolgardie Shire,
Western Australia, hydrohonessite has been found encrusting fractures in the oxidised portions of
nickel-iron sulphide deposits.
Associated minerals include honessite,
reevesite, magnesite,
gaspéite, pecoraite,
goethite and gypsum
(HOM).
At Hagdale Quarry, Unst, Shetland Islands, Scotland, UK, hydrohonessite occurs in
chromitite associated with
honessite, reevesite and
theophrastite
(HOM).
At the Cameron Mining District, Coconino County, Arizona, USA, hydrohonessite is associated with
wupatkiite,
nickelboussingaultite and
pickeringite
(HOM).
Near Linden, Upper Mississippi Valley Mining District, Iowa county, Wisconsin, USA, hydrohonessite occurs in
chromitite
(HOM).
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