Steacyite
A variety of Minerals
What is Steacyite?
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.
Steacyite Market Value Calculator
Estimate the market value of Steacyite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Steacyite Localities Map
See where Steacyite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
Quick Facts
Physical Properties
- Color
- Gray, dark brown, green, beige
- Hardness (Mohs)
- 5
Chemical Properties
- Chemical Formula
- K0.3(Na,Ca)2ThSi8O20
- Elements
- Ca, K, Na, O, Si, Th
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