Chemistry:Steacyite
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| Steacyite | |
|---|---|
 Steacyite crystals from the type locality of Mont-Saint-Hilaire, Quebec | |
| General | |
| Category | Cyclosilicate |
| Formula (repeating unit) | K variable(Ca,Na) 2(Th,U)Si 8O 20 |
| 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 |
| |re|er}} | Vitreous, greasy, dull |
| Diaphaneity | Translucent, opaque |
| Other characteristics |  Radioactive |
Steacyite is a complex silicate mineral containing thorium and uranium; formula K
variable(Ca,Na)
2(Th,U)Si
8O
20. 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. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.
- ↑ Dunn, P.J.; Fleischer, M.; Burns, R.G.; Pabst, A. (1983). "New mineral names". American Mineralogist 68: 471–000. http://www.minsocam.org/ammin/AM68/AM68_471.pdf. Retrieved 14 March 2022.
Sources
See also
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