Boehmite Mineral Data

Boehmite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[Mineral Forums] [Minerals for Sale] [About Us] [En Espanol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996


General Boehmite Information

Help on Chemical Formula: Chemical Formula: AlO(OH)
Help on Composition: Composition: Molecular Weight = 59.99 gm
   Aluminum  44.98 %  Al   84.98 % Al2O3
   Hydrogen   1.68 %  H    15.02 % H2O
   Oxygen    53.34 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: AlO(OH)
Help on Environment: Environment: Major constituent of most bauxite ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1927
Help on Locality: Locality: Subtropical areas (Jamaica, Surinam, Guyana, Georgia, USA. France, Hungary, Russia, Greece, Australia, and Guinea) of high rainfall where lateritic soils can develop on Al-bearing igne Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the German geologist and paleontologist, J. Bohm (1857-1938).
Help on Name Pronunciation: Name Pronunciation: Boehmite Say BOEHMITE
Help on Synonym: Synonym: Bauxite - Al ore mixture
  Cliachite - colloidal Al hydroxide
  Kliachite - colloidal Al hydroxide
  Pseudoboehmite - colloidal böhmite
 

Boehmite Image

Click Here for Larger Boehmite Image in a New Browser Window Images:
Click Here for Larger Boehmite Image

Boehmite

Comments: Crystalline boehmite in bauxite rock.
Location: Bauxite, Saline County, Arkansas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Boehmite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.2345:1:0.3026
Help on Cell Dimensions: Cell Dimensions: a = 2.868, b = 12.227, c = 3.7, Z = 4; V = 129.75 Den(Calc)= 3.07
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Amam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.11(1), 3.164(0.65), 2.346(0.53),
 

Physical Properties of Boehmite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: White, Light yellow, Yellowish green.
Help on Density: Density: 3 - 3.07, Average = 3.03
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Pistolitic - > 3mm rounded spherical grains.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Boehmite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KPDmeas= 0.2152,KC= 0.227
Ncalc = 1.68 - 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.646, b=1.652, g=1.661, bire=0.0150, 2V(Calc)=80, 2V(Meas)=80.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Boehmite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Boehmite =3.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002585608
Boson Index = 0.9997414392
Help on Photoelectric: Photoelectric: PEBoehmite = 1.35 barns/electron
U=PEBoehmite x rElectron Density= 4.09 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Boehmite is Not Radioactive
 

Boehmite Classification
Help on Dana Class: Dana Class: 06.01.02.01 (06)Hydroxides and Oxides Containing Hydroxyl
  (06.01)where X+++O OH
  (06.01.02)Boehmite Group
 
06.01.02.01 Boehmite AlO(OH) Amam 2/m 2/m 2/m
 
06.01.02.02 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m
 
06.01.02.03 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 04.FE.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
 
04.FE.15 Boehmite AlO(OH) Amam 2/m 2/m 2/m
 
04.FE.15 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m
 

Other Boehmite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Boehmite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - MinMax(Deutsch)
8 - MinMax(English)
9 - Mineralienatlas (Deutsch)
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - University of Colorado - Mineral Structure Data
13 - WWW-MINCRYST

Search for Boehmite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Boehmite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Boehmite Mineral Data :

Ask about Boehmite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Boehmite Specimen Label here :

Boehmite

AlO(OH)
Dana No: 06.01.02.01 Strunz No: 04.FE.15
Locality:

 

Notes: