Diaspore Mineral Data

[Mineral Auctions] [Register] [Current Auctions] [Log In] [www.danweinrich.com]
Dan Weinrich Auctions
Specializing In Live Weekly Auctions Of Top Quality Mineral Specimens
The Place To Find Great Specimens At Great Prices!

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.

Name Pronunciation:

Diaspore

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:

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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:

Non-fluorescent.

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
Ncalc = 1.75 - 1.79

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.

Calculated Properties of Diaspore

Electron Density:

Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Diaspore =3.38 gm/cc.

Fermion Index:

Fermion Index = 0.0002585608
Boson Index = 0.9997414392

Photoelectric:

PE_Diaspore= 1.35 barns/electron
U=PE_Diaspore x rElectron Density= 4.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Diaspore is Not Radioactive

Diaspore Classification

Dana Class:

06.01.01.01 (06)Hydroxides and Oxides Containing Hydroxyl

(06.01)where X+++O OH

(06.01.01)Diaspore group (Orthorhombic, Pnma or Pnmd)

06.01.01.01 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m

06.01.01.02 Goethite FeO(OH) Pbnm 2/m 2/m 2/m

06.01.01.03 Groutite MnO(OH) Pbnm 2/m 2/m 2/m

06.01.01.04 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m

06.01.01.05 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m

06.01.01.06 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

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

Search for Diaspore using:

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

Visit our Advertisers for Diaspore :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Diaspore Mineral Data :

Ask about Diaspore 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 Diaspore Specimen Label here :

Diaspore

AlO(OH)
Dana No: 06.01.01.01 Strunz No: 04.FD.10
Locality:

Notes: