Chemistry:Akdalaite
From HandWiki
| Akdalaite | |
|---|---|
| General | |
| Category | Mineral |
| Formula (repeating unit) | 5Al 2O 3 · H2O |
| Identification | |
| Color | White, pale greenish yellow in thin section |
| Fracture | Irregular/uneven |
| Mohs scale hardness | 7–7.5 |
| |re|er}} | 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 5Al
2O
3 · H2O.[2] It was formerly believed to be 4Al
2O
3 · H
2O. 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. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
- ↑ 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
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