Steacyite
Appearance
Steacyite | |
---|---|
General | |
Category | Cyclosilicate |
Formula (repeating unit) | Kvariable(Ca,Na)2(Th,U)Si8O20 |
Strunz classification | 9.CH.10 |
Crystal system | Tetragonal |
Crystal class | Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m) |
Space group | P4/mcc |
Identification | |
Color | Gray, dark brown, green, beige |
Mohs scale hardness | 5 |
Luster | Vitreous, greasy, dull |
Diaphaneity | Translucent, opaque |
Steacyite is a complex silicate mineral containing thorium and uranium; formula Kvariable(Ca,Na)2(Th,U)Si8O20. It forms small brown or yellow green crystals, often cruciform twinned crystals. It is radioactive. It was discovered at Mont-Saint-Hilaire, Quebec in 1982 and is named after Harold Robert Steacy (1923–2012), mineralogist.[1]
References
- Notes
- Sources
See also