Formula: CdS
Sulphide, sphalerite group, paramorph of greenockite
Specific gravity: 4.87 calculated
Hardness: 2½ to 3
Streak: Light yellow
Colour: Bright yellow

Hydrothermal environments

Hawleyite occurs as coatings on fine-grained sphalerite and siderite in vugs, probably of secondary origin, deposited from meteoric waters in vugs and along late fractures. Associated minerals include sphalerite, siderite and greenockite (HOM, Mindat).


At the Kintore opencut, Broken Hill South Mine, Broken Hill, Broken Hill district, Yancowinna county, New South Wales, Australia, hawleyite is found as powdery crusts in sulphide ore and in quartz - garnet gneiss (AJM 3.1.31).

At the type locality, the Hector-Calumet mine, Calumet, Galena Hill, Mayo mining district, Yukon, Canada, the consolidated rocks underlying the area are mainly sediments consisting of sericitic, chloritic, and graphitic schist, phyllite and quartzite, with sills and lenses of greenstone. There are two types of veins; an early vein type consisting of quartz, pyrite and arsenopyrite, and a late vein type mineralised with siderite, galena, sphalerite and argentian tetrahedrite. The minerals found in the oxidised zone include limonite, manganese oxides, calcite, gypsum, smithsonite, cerussite, anglesite, quartz, azurite, malachite and oxides of arsenic and antimony. The specimen of hawleyite was obtained from a vuggy part of the primary zone (AM 40.555-559).

At the San Rafael Mine, Quartz Mountain camp, Lodi Mining District, Lodi Hills, Nye county, Nevada, USA, hawleyite has been found within a single large boulder as pulverulent bright yellow joint coatings and local vug fillings. Associated minerals include arsenopyrite and zincian siderite, together with minor gypsum (R&M 85.6.518).

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