Mineralogy Database

Diaspore Mineral Data

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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 Name Pronunciation: Name Pronunciation: Diaspore Say DIASPORE
Help on Synonym: Synonym: ICSD 200952
  PDF 5-355

Diaspore Image

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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 - Dipyramidal H-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:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 0 1 0) ( 0 2 1) ( 1 1 0)

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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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
Ncalc = 1.75 - 1.79
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.

Calculated Properties of Diaspore

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Diaspore =3.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002585608
Boson Index = 0.9997414392
Help on Photoelectric: Photoelectric: PEDiaspore = 1.35 barns/electron
U=PEDiaspore x rElectron Density= 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: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.01)where X+++O OH
  (06.01.01)Diaspore group (Orthorhombic, Pnma or Pnmd) Diaspore AlO(OH) Pbnm 2/m 2/m 2/m Goethite FeO(OH) Pbnm 2/m 2/m 2/m Groutite MnO(OH) Pbnm 2/m 2/m 2/m Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.FD.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra
04.FD.10 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m
04.FD.10 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

Other Diaspore Information

Help on See Also: See Also: Links to other databases for Diaspore :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Tradeshop.com - The Rainbow of Gems
17 - University of Colorado - Mineral Structure Data

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Dana No: Strunz No: 04.FD.10





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