This specimen shows cadmium yellow Hawleyite, accompanied by siderite and cleavages of bright metallic galena. Glows bright yellow under UV. This is a rare sulfide mineral in the sphalerite group, dimorphous and easily confused with greenockite. Chemically, it is cadmium sulfide, and occurs as a bright yellow coating on sphalerite or siderite in vugs, deposited by meteoric water. It was discovered in 1955 in the Hector-Calumet mine, Keno-Galena Hill area, Yukon Territory and named in honour of mineralogist James Edwin Hawley (1897–1965), a professor at Queen's University in Ontario, Canada.
This specimen was featured as the Photo of the Day on Mindat.org - 29th Jul 2017, https://www.mindat.org/photo-561432.html
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