Hydrated sulphate containing hydroxyl
Specific gravity: 2.665
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
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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