Specific gravity: 7.02
Colour: Lead gray, Gray blue, Yellow blue, Silver gray.
At the type locality, the British Columbia Molybdenum Ltd. mine, Patsy Creek, Kitsault, Alice Arm, Skeena Mining Division, British Columbia, Canada, neyite is a primary sulphide mineral in the porphyry molybdenum deposit (Webmin). It occurs in late-forming cross-cutting hydrothermal quartz veins in a quartz-molybdenite stockwork. Associated minerals include pyrite, galena, sphalerite, chalcopyrite, aikinite, cosalite, tetrahedrite, nuffieldite and molybdenite (HOM).
At the Johnny Lyon Hills, Cochise County, Arizona, USA, neyite occurs in quartz veins associated with gold, chalcopyrite and nordströmite, as well as quartz (HOM).
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