Akdalaite (
IMA symbol: Akd) is a very rare
mineral
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2 ...
found in
Kazakhstan
Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...
and has the formula 5
Al2 O3·
H2O. It was formerly believed to be 4
Al2 O3·
H2O. It is therefore the same as
tohdite an artificially produced phase. Studies on the crystal structure and spectra indicate that this is an aluminium oxide hydroxide.
[Ab-initio quantum mechanical study of akdalaite (5Al2O3· H2O): structure and vibrational spectrum, Demichelis, R.; Noel, Y.; Zicovich-Wilson, C. M.; Roetti, C.; Valenzano, L.; Dovesi, R., Journal of Physics: Conference Series, Volume 117, Issue 1, pp. 012013 (2008)., ]
References
External links
Fact sheetfrom
mindat.org
Fact sheetfro
webmineral.com
Oxide minerals
Hydroxide minerals
Aluminium minerals
Hexagonal minerals
{{oxide-mineral-stub