Hawleyite

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Hawleyite
Hawleyite.jpg
Orange-yellow earthy coating
General
Category Sulfide mineral
Formula
(repeating unit)
CdS
Strunz classification 02.CB.05a
Crystal symmetry Isometric 4 3m
Unit cell a = 5.818 Å; Z = 4
Identification
Color Bright yellow
Crystal habit Powdery massive
Crystal system Cubic-hextetrahedral
Mohs scale hardness 2.5-3
Luster Metallic
Streak Light yellow
Diaphaneity Translucent to opaque
Specific gravity 4.87
References [1][2][3]
Structure of Hawleyite

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.[3]

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.[2][1]

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