Hawleyite
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| Hawleyite | |
|---|---|
 Orange-yellow earthy coating |
|
| General | |
| Category | Mineral |
| Chemical formula | CdS |
| Identification | |
| Colour | Bright yellow |
| Crystal habit | Powdery massive |
| Crystal system | Cubic-hextetrahedral |
| Cleavage | N/A |
| Fracture | N/A |
| Mohs Scale hardness | 2.5-3 |
| Lustre | Metallic |
| Refractive index | N/A |
| Pleochroism | N/A |
| Streak | Light yellow |
| Specific gravity | 4.87 |
| Fusibility | N/A |
| Solubility | N/A |
Hawleyite is a rare sulfide mineral in the sphalerite group, dimorphous and easily confused with greenockite. Chemically, it is a cadmium sulfide, and occurs as a bright yellow coating on sphalerite or siderite in vugs, deposited by meteoric waters. It was discovered in 1955 and named in honour of mineralogist James Edwin Hawley, a professor at Queen's University in Ontario, Canada.
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