Diaspore Mineral Data + Say DIASPORE

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General Diaspore 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: Metamorphic and sedimentary bauxite ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1801
Help on Locality: Locality: Common world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek word "to scatter," referring to the mineral's easy disintegration in the blowpipe flame.
Help on Synonym: Synonym: ICSD 200952
  PDF 5-355
 

Diaspore Image

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Diaspore

Comments: Crystals of deep violet-colored diaspore exposed from numerous vugs.
Location: Saga Quarry, Oslo Region Norway. Scale: Crystal size 1 cm.
© John Veevaert

Diaspore Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4667:1:0.3018
Help on Cell Dimensions: Cell Dimensions: a = 4.397, b = 9.421, c = 2.8439, Z = 4; V = 117.81 Den(Calc)= 3.38
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.99(1), 2.317(0.56), 2.131(0.52),
Help on Forms: Forms:

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Forms: [ 1 1 1] [ 0 1 0] [ 0 2 1] [ 1 1 0]

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Hill R J , Physics and Chemistry of Minerals , 5 (1979) p.179-200, Crystal structure refinement and electron density distribution in diaspore, Sample: Neutral atom refinement

View Additional jPOWD Structure files for Diaspore
[1] [2] [3] [4] [5]
 

Physical Properties of Diaspore

Help on Cleavage: Cleavage: [010] Perfect, [110] Good
Help on Color: Color: White, Greenish gray, Grayish brown, Colorless, Yellow.
Help on Density: Density: 3.3 - 3.5, Average = 3.4
Help on Diaphaniety: Diaphaniety: Transparent to subtranslucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Diaspore

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2142,KPDmeas= 0.2129,KC= 0.227
Help on Optical Data: Optical Data: Biaxial (+), a=1.7-1.702, b=1.72-1.722, g=1.747-1.752, bire=0.0470-0.0500, 2V(Calc)=80-84, 2V(Meas)=80-88. Dispersion weak, r < v.
Help on Pleochroism (x): Pleochroism (x): colorless or colorless.
Help on Pleochroism (y): Pleochroism (y): colorless or pale red.
Help on Pleochroism (z): Pleochroism (z): pale blue or reddish brown.
 

Calculated Properties of Diaspore

Help on Electron Density: Electron Density:

relectron=3.38 gm/cc
note: rDiaspore =3.38 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00025
Boson Index = 0.99975
Help on Photoelectric: Photoelectric:

PEDiaspore = 1.35 barns/electron
U=PEDiaspore x relectron= 4.55 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Diaspore is Not Radioactive

 

Diaspore Classification

Help on  Dana Class: Dana Class: 6.1.1.1 (6)Hydroxides and Oxides Containing Hydroxyl
  (6.1)where X+++O OH
  (6.1.1)Diaspore group (Orthorhombic, Pnma or Pnmd)
 
6.1.1.1 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.2 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.3 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.4 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.5 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m
 
6.1.1.6 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: IV/F.06-10 IV - Oxides
  IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure
  IV/F.06 - Diaspore - Goethite - Faitknechtite series
 
IV/F.06-10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-20 Boehmite AlO(OH) Amam 2/m 2/m 2/m
 
IV/F.06-25 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-30 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-40 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m
 
IV/F.06-50 Akaganeite Fe(O,OH,Cl) I2/m 2/m
 
IV/F.06-60 Feroxyhyte FeO(OH) Unk Hex
 
IV/F.06-70 Manganite MnO(OH) B21/d 2/m
 
IV/F.06-80 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
 
IV/F.06-90 Feitknechtite beta-MnO(OH) Unk Hex
 

Other Diaspore Information

Help on References: References: NAME( ODonoghue90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Diaspore :
1 -Am. Min. Crystal Structure Database 2 - Applied Mineralogy 3 -Athena 4 - CalTech Mineral Spectroscopy 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 - Minerals of Wisconsin 15 -QUT Mineral Atlas 16 - Tradeshop.com - The Rainbow of Gems 17 -University of Colorado - Mineral Structure Data 18 - WWW-MINCRYST 19 -École des Mines de Paris

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Diaspore

AlO(OH)
Dana No: 6.1.1.1 Strunz No: IV/F.06-10
Locality:

 

Notes:

 

 
   
 
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