Image: Wikimedia Commons

böhmite

Hydroxide mineral

Also known as boehmite

Instance of: mineral species
1
Sources
1.Stated in The IMA List of Minerals (November 2021)
View statement on Wikidata ↗
Subclass of: diaspore mineral group
1
Sources
1.Stated in Fleischer’s Glossary of Mineral Species 2014
View statement on Wikidata ↗

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Boehmite or böhmite is an aluminium oxide hydroxide mineral, a component of the aluminium ore bauxite. It is dimorphous with diaspore. It crystallizes in the orthorhombic dipyramidal system and is typically massive in habit. It is white with tints of yellow, green, brown or red due to impurities. It has a vitreous to pearly luster, a Mohs hardness of 3 to 3.5 and a specific gravity of 3.00 to 3.07. It is colorless in thin section, optically biaxial positive with refractive indices of nα = 1.644 – 1.648, nβ = 1.654 – 1.657 and nγ = 1.661 – 1.668.

Overview

All data

52 statements · 31% with external sources · numbers in brackets are citations

Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 4.FE.15
IMA status and/or rank: grandfathered mineral (G)
1
Sources
1.Stated in The IMA List of Minerals (February 2013)
View statement on Wikidata ↗
Nickel-Strunz 9th edition (updated 2009): 4.FE.15
1
Sources
1.Stated in mineralienatlas.de
View statement on Wikidata ↗
Named after: Johann Böhm
1
Sources
1.Stated in mineralienatlas.de
View statement on Wikidata ↗
Streak color: white
Members / parts: hydroxidooxidoaluminium
IMA Mineral Symbol: Bhm
1
Sources
1.Stated in IMA–CNMNC approved mineral symbols
View statement on Wikidata ↗
Formula: AlO(OH)
Strunz 8th edition (series ID, updated): IV/F.04c
1
Sources
1.Stated in Mineralogische Tabellen : Eine Klassifizierung der Mineralien auf kristallchemischer Grundlage, mit einer Einfuhrung in die Kristallchemie (1982)
View statement on Wikidata ↗
Space group: space group 62
Crystal system: orthorhombic crystal system
Density: 3,410.06 kg/m³ temperature: 0 K · state of matter: solid
Bulk modulus: 144B Pa
Shear modulus: 113B Pa
Poisson's ratio: 0.189
Point group: orthorhombic-bipyramidal
Mohs' hardness: 3.5

On other databases

32 identifiers linking böhmite across the web's reference databases

Data quality

statements

31%

externally sourced

Source last edited September 2, 2026. AIDB refreshes this page daily.

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AIDB. (2026). böhmite (Q409757). Retrieved from https://aidb.si/e/bohmite-Q409757