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|Name:||The artificial compound is thought to have been named for the 19th century German metallurgist Karl J. Bayer (1847-1904). The name was then applied to the natural mineral.|
|Doyleite, Gibbsite, Nordstrandite|
This page provides mineralogical data about Bayerite.
Classification of Bayerite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||4/F.02-20|
|Nickel-Strunz 10th (pending) edition ID:||4.FE.10|
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
E : Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
|Dana 8th edition ID:||126.96.36.199|
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
3 : X(OH)3
|Hey's CIM Ref.:||7.6.5|
7 : Oxides and Hydroxides
6 : Oxides of Al
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Type Occurrence of Bayerite
|Type Locality:||Hatrurim Formation, Negev, Israel|
|Geological Setting of type material:||Precipitates from high-aluminium gels at pH values above 5.8|
|Associated Minerals at type locality:|
Occurrences of Bayerite
|Geological Setting:||In bauxites; as weathered crusts on amphiboles and pyroxenes|
Physical Properties of Bayerite
|Diaphaneity (Transparency):||Transparent, Translucent|
|Density (measured):||2.53 g/cm3|
|Density (calculated):||2.54 g/cm3|
Crystallography of Bayerite
|Class (H-M):||2/m - Prismatic|
|Cell Parameters:||a = 5.0626Å, b = 8.6719Å, c = 9.4254Å|
β = 90.26°
|Ratio:||a:b:c = 0.584 : 1 : 1.087|
|Unit Cell Volume:||V 413.79 Å³ (Calculated from Unit Cell)|
|Morphology:||As very fine fibers; also as flaky and tabular crystals, to 0.1 mm; in radiating hemispherical aggregates and crusts|
|X-Ray Powder Diffraction:|
|Comments:||Recorded on type material|
Optical Data of Bayerite
|RI values:||nα = 1.565 - 1.574 nγ = 1.580 - 1.584|
|Maximum Birefringence:||δ = 0.015|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Bayerite
|Simplified for copy/paste:||Al(OH)3|
|Essential elements:||Al, H, O|
|All elements listed in formula:||Al, H, O|
|Analytical Data:||No chemical analysis appears to have been published.|
Relationship of Bayerite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Bayerite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Bayerite
Gross, S. and Heller, L. (1963): A natural occurrence of bayerite. Mineralogical Magazine 33, 723-724. - American Mineralogist (1964) 49, 819 (abstract).
Khorosheva, D. P. (1968): Bayerite from the bauxite horizon of the middle Dnieper region. Doklady Acad. Nauk SSSR, 182, 123-126 (in Russian).
Schoen, R. and Roberson, C. E. (1970): Structures of aluminum hydroxide and geochemical implications. American Mineralogist 55, 43-77.
McHardy, W. J. and Thomson, A. P. (1971): Conditions for the formation of bayerite and gibbsite. Mineralogical Magazine 38, 358-368.
Gross, S. (1977): The mineralogy of the Hatrurim Formation, Israel. Geol. Sur. Israel Bull. 70, 14-15.
Zigan, F., Joswig, W. and Burger, N. (1978): Die Wasserstoffpositionen im Bayerit, Al(OH)3. Zeitschrift für Kristallographie 148, 255-273 (in German with English abstract).
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 47.
Internet Links for Bayerite
Localities for Bayerite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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New Locality Added: Pontével, Cartaxo, Santarém District, PortugalFrom Rui Nunes, 25th Oct 2014 21:07:20