Yegorovite
H–M symbol: (2/m)
Yegorovite, ([Na4[Si4O8(OH)4]·7H2O]) is a silicate mineral found in a hyperalkaline pegmatite in the Lovozero Pluton at Mt. Kedykverpakhk in the Kola Peninsula of Russia. It was named in memory of Russian crystallographer Yurii Kavdievich Yegorov-Tismenko, and approved by the Commission on New Minerals and Mineral Names, International Mineralogical Association in 2008.[1]
Physical properties
Yegorovite is colorless, with a white streak. Found in small quantities among pegmatites. It is a natural silicate of alkali cations.[1][2]
Chemical composition
The chemical composition of yegorovite in elemental weight percent is as follows:
element | weight % |
---|---|
Na2O | 23.28 |
SiO2 | 45.45 |
H2O | 31.27 |
Total | 100.0 |
Crystal structure
The crystal structure of yegorovite is made up of a single chain of four silicon (Si) tetrahedrons [Si4O8(OH)4]∞ and sixfold polyhedrons of [NaO(OH)2(H2O)3] and [NaO(OH)(H2O)4] centered by sodium (Na).
References
- ^ a b c Pekov, I. V. et al., 2010, Yegorovite, Na4[Si4O8(OH)4]·7H2O, a New Mineral from the Lovozero Alkaline Pluton, Kola Peninsula. Geology of Ore Deposits 52.7 (2010): 584–590.
- ^ a b https://www.mindat.org/min-38851.html