Diaspore Mineral Data

Diaspore Mineral Data +

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General Diaspore Information

Chemical Formula:

AlO(OH)

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

Empirical Formula:

AlO(OH)

Environment:

Metamorphic and sedimentary bauxite ores.

IMA Status:

Valid Species (Pre-IMA) 1801

Locality:

Common world wide. Link to MinDat.org Location Data.

Name Origin:

From the Greek word "to scatter," referring to the mineral's easy disintegration in the blowpipe flame.

Synonym:

ICSD 200952

PDF 5-355

Diaspore Image

Images:

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

Axial Ratios:

a:b:c =0.4667:1:0.3018

Cell Dimensions:

a = 4.397, b = 9.421, c = 2.8439, Z = 4; V = 117.81 Den(Calc)= 3.38

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/I_o): 3.99(1), 2.317(0.56), 2.131(0.52),

Forms:

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Crystal Structure:

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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

Cleavage:

[010] Perfect, [110] Good

Color:

White, Greenish gray, Grayish brown, Colorless, Yellow.

Density:

3.3 - 3.5, Average = 3.4

Diaphaniety:

Transparent to subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6.5-7 - Pyrite-Quartz

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Diaspore

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

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.

Pleochroism (x):

colorless or colorless.

Pleochroism (y):

colorless or pale red.

Pleochroism (z):

pale blue or reddish brown.

Calculated Properties of Diaspore

Electron Density:

r_electron=3.38 gm/cc
note: r_Diaspore=3.38 gm/cc.

Fermion Index

Fermion Index = 0.00025
Boson Index = 0.99975

Photoelectric:

PE_Diaspore= 1.35 barns/electron
U=PE_Diaspore x r_electron= 4.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Diaspore is Not Radioactive

Diaspore Classification

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

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

References:

NAME( ODonoghue90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Diaspore

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

Notes: