Chemistry:Kenyaite
Kenyaite is a mineral and is a peculiar sodium silicate having a layered structure.[1] It has a chemical formula of Na2Si22O41(OH)8 • 6H2O,[2][3] which means it is made up of variations of different materials including sodium, silicon, hydrogen, and oxygen.[4] The chemical composition of kenyaite is subject to change: when the interlayer of water has different variations; it undergoes different physical conditions; by partial to full exchange of the sodium ions by protons when kenyaite comes into contact with water. This is typical for intracrystalline reactive materials.[5]
Name
The name kenyaite derives from Kenya as this is the location where it was first discovered.[1]
Physical properties
Kenyaite is white in colour and can range from being transparent to translucent.[3] It has a hardness of roughly 4 on Mohs scale of mineral hardness.[2] Kenyaite has a white streak and a density of 3.18. This mineral has a molecular mass of 1,563.99 gm/mol.[4] The mineral habits within kenyaite can be described as concretionary and nodular.[4] These nodules range in size and shape.[2]
Reactions
Kenyaite has been shown to form from the leaching of magadiite, and also from evaporating saline brines in playa evaporite alkaline lake deposits.[4] It can be transformed into quartz when kenyaite decomposes.[5]
Distribution of Deposits
Kenyaite is found in different parts of the globe including, near Trinity Lake, California, Kafra, Niger, and Lake Magadi in Kenya.[3]
References
- ↑ 1.0 1.1 McAtee, J.L; House, R.; Eugster, H.P (1968). "Magadiite from Trinity County, California". The American Mineralogist 53: 2061–2069. http://www.minsocam.org/ammin/AM53/AM53_2061.pdf.
- ↑ 2.0 2.1 2.2 Shtenberg, M.V.; Popov, V.A.; Lebedeva, S.M.; Zainullina, R.T.; Rassomakhin, M.A. (24 April 2019). "Vibrational Spectroscopy of Kenyaite and Magadiite in the Southern Urals". Minerals: Structure, Properties, Methods of Investigation.. Springer Proceedings in Earth and Environmental Sciences (Springer, Cham): 237–243. doi:10.1007/978-3-030-00925-0_35. ISBN 978-3-030-00924-3. https://link.springer.com/chapter/10.1007/978-3-030-00925-0_35.
- ↑ 3.0 3.1 3.2 Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (1995). "Kenyaite". Handbook of Mineralogy (Mineral Data Publishing). http://www.handbookofmineralogy.org/pdfs/kenyaite.pdf.
- ↑ 4.0 4.1 4.2 4.3 Barthelmy, Dave. "Kenyaite Mineral Data". http://webmineral.com/data/Kenyaite.shtml#.YZbWIdDMLD4.
- ↑ 5.0 5.1 Beneke, Klaus; Lagaly, Gerhard (1983). "Kenyaite--synthesis and properties". American Mineralogist 68: 818–826. http://www.minsocam.org/ammin/AM68/AM68_818.pdf.
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