Yegorovite, (
a4[Si4O8(OH)4·7H
2O]) 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
Founded in 1958, the International Mineralogical Association (IMA) is an international group of 40 national societies. The goal is to promote the science of mineralogy and to standardize the nomenclature of the 5000 plus known mineral species. Th ...
in 2008.
Physical properties
Yegorovite is colorless, with a white streak. Found in small quantities among pegmatites. It is a natural silicate of
alkali
In chemistry, an alkali (; from ar, القلوي, al-qaly, lit=ashes of the saltwort) is a basic, ionic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a ...
cation
An ion () is an atom or molecule with a net electrical charge.
The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convent ...
s.
Chemical composition
The chemical composition of yegorovite in elemental weight percent is as follows:
Crystal structure
The crystal structure of yegorovite is made up of a single chain of four silicon (Si) tetrahedrons
i4O8(OH)4sup>∞ and sixfold polyhedrons of
aO(OH)2(H2O)3and
aO(OH)(H2O)4centered by sodium (Na).
References
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Silicate minerals
Monoclinic minerals