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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Steacyite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Steacyite Localities Map
See where Steacyite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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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Steacyite FAQs
How do I identify Steacyite?
Steacyite can be identified by its hardness of 5 on the Mohs scale, Gray color. Look for these key characteristics when examining specimens.
What color is Steacyite?
Steacyite typically appears in Gray, dark brown, green, beige. Color can vary depending on impurities and formation conditions.
How hard is Steacyite?
Steacyite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.
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