Steacyite
Kvariable(Ca,Na)2(Th,U)Si8O20IMA symbol Scy[1] 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 Other characteristics
Radioactive
H-M symbol: (4/m 2/m 2/m)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Radioactive.svg/25px-Radioactive.svg.png)
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.[2]
References
Notes
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Dunn, P.J.; Fleischer, M.; Burns, R.G.; Pabst, A. (1983). "New mineral names" (PDF). American Mineralogist. 68: 471–000. Retrieved 14 March 2022.
Sources
- Handbook of Mineralogy
- mindat page for steacyite
See also
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