Akdalaite

Akdalaite
Akdalaite
General
Category	Mineral
Formula; (repeating unit)	5Al2O3·H2O
IMA symbol	Akd
Identification
Color	White, pale greenish yellow in thin section
Fracture	Irregular/uneven
Mohs scale hardness	7–7.5
Luster	Vitreous
Streak	White
Diaphaneity	Translucent
Specific gravity	3.68

Akdalaite (IMA symbol: Akd^[1]) is a very rare mineral found in Kazakhstan and has the formula 5Al₂O₃·H₂O.^[2] It was formerly believed to be 4Al₂O₃·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.^[3]

References

^ Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ A New Occurrence and New Data on Akdalaite, a Retrograde Mineral from UHP Whiteschist, Kokchetav Massif, Northern Kazakhstan, Shyh-Lung Hwang, Pouyan Shen, Hao-Tsu Chu, Tzen-Fu Yui, International Geology Review, 48, 8, 2006, 754-764, doi:10.2747/0020-6814.48.8.754
^ 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)., doi:10.1088/1742-6596/117/1/012013

External links

Fact sheet from mindat.org
Fact sheet from webmineral.com

This article about a specific oxide mineral is a stub. You can help Wikipedia by expanding it.

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[1] Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[2] A New Occurrence and New Data on Akdalaite, a Retrograde Mineral from UHP Whiteschist, Kokchetav Massif, Northern Kazakhstan, Shyh-Lung Hwang, Pouyan Shen, Hao-Tsu Chu, Tzen-Fu Yui, International Geology Review, 48, 8, 2006, 754-764, doi:10.2747/0020-6814.48.8.754

[3] 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)., doi:10.1088/1742-6596/117/1/012013

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