|Color||Gray, dark brown, green, beige|
|Mohs scale hardness||5|
|Luster||Vitreous, greasy, dull|
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.
|This article about a specific silicate mineral is a stub. You can help Wikipedia by expanding it.|