Steacyite is a complex silicate mineral containing thorium and uranium; formula . It forms small brown or yellow green crystals, often cruciform

twinned Twinning (making a twin of) may refer to: * In biology and agriculture, producing two offspring (i.e., twins) at a time, or having a tendency to do so; * Twin towns and sister cities, towns and cities involved in town twinning * Twinning inst ...

crystals. It is radioactive. It was discovered at Mont-Saint-Hilaire, Quebec in 1982 and is named after

Harold Robert Steacy Harold "Hal" Robert Steacy (June 7, 1923 – April 7, 2012) was a Canadian mineralogist who was the curator of the Canadian National Mineral Collection at the Geological Survey of Canada in Ottawa. The mineral steacyite Steacyite is a compl ...

(1923–2012), mineralogist.

References

;Notes ;Sources
Handbook of Mineralogy

References

See also