Formula: Mg9Zn4(SO4)2(OH)22.8H2O
Hydrated sulphate containing hydroxyl
Crystal System: Monoclinic
Specific gravity: 2.665 measured, 2.65 calculated
Hardness: 3
Streak: White to colourless
Colour: Rarely colourless, white, usually light brown with a red grey tint, rarely very pale blue grey; colourless in
transmitted light
Solubility: Soluble in acids
Environments
Localities
To date (September 2020) torreyite is known only from its type locality, the Sterling mine, Sterling Hill, Ogdensburg,
Franklin Mining District, Sussex county, New Jersey, USA, where it is a
secondary mineral occurring in manganese-rich veinlets and fractures
in the Precambrian metamorphosed
zinc-manganese-iron
deposit. Associated minerals include
zincite, rhodochrosite,
pyrochroite, sussexite,
franklinite, willemite,
calcite, mooreite and
fluoborite
(AM 64.952, Mindat, HOM).
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