Woodallite Mineral Data


[Newest Minerals] [Minerals for Sale] [Tsumeb Mine] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa and Mastercard are Welcome

General Woodallite Information

Help on Chemical  Formula: Chemical Formula: Mg6Cr2(OH)16Cl2·4(H2O)
Help on Composition: Composition: Molecular Weight = 659.31 gm
   Magnesium  22.86 %  Mg   37.90 % MgO
   Aluminum    0.82 %  Al    1.55 % Al2O3
   Chromium    9.46 %  Cr   13.83 % Cr2O3
   Iron        4.24 %  Fe    6.06 % Fe2O3
   Hydrogen    3.67 %  H    32.79 % H2O
   Carbon      0.36 %  C     1.34 % CO2
   Chlorine    8.60 %  Cl    8.60 % Cl
                -   %  Cl   -1.94 % -O=Cl2
   Oxygen     49.99 %  O
             ______        ______ 
             100.00 %      100.12 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6.2Cr1.2Fe3+0.5Al0.2(OH)16Cl1.6(CO3)0.2·4(H2O)
Help on Environment: Environment: Altered dunite associated with Cr minerals.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Mount Keith nickel deposit, 90 km NNE of Leinster, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Roy Woodall (1930-), Australian geologist.
Help on Synonym: Synonym: IMA2000-042
 

Search for Woodallite Images

Click Here To Search Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

  

Woodallite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:7.77022
Help on Cell Dimensions: Cell Dimensions: a = 3.103, c = 24.111, Z = 0.375; V = 201.05 Den(Calc)= 2.04
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.04(1)(003), 2.0072(0.6)(0.1.12), 4.0205(0.48)(006),2.624(0.3), 2.3488(0.05)(015),
 

Physical Properties of Woodallite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Deep magenta, Purple.
Help on Density: Density: 2.062
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Resinous - Waxy
Help on Streak: Streak: pale pinkish white
 

Optical Properties of Woodallite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2672,KPDmeas= 0.2643,KC= 0.2797
Help on Optical Data: Optical Data: Uniaxial (-), e=1.535, w=1.555, bire=0.0200.
 

Calculated Properties of Woodallite

Help on Electron Density: Electron Density:

relectron=2.08 gm/cc
note: rWoodallite =2.04 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03302
Boson Index = 0.96698
Help on Photoelectric: Photoelectric:

PEWoodallite = 4.40 barns/electron
U=PEWoodallite x relectron= 9.15 barns/cc.

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

Woodallite is Not Radioactive

 

Woodallite Classification

Help on  Dana Class: Dana Class: 6.4.5.2 (6)Hydroxides and Oxides Containing Hydroxyl
  (6.4)containing multiple cations
  (6.4.5)Dana Group
 
6.4.5.1 Iowaite Mg4Fe(OH)8OCl·2-4(H2O) R 3m 3 2/m
 
6.4.5.2 Woodallite ! Mg6Cr2(OH)16Cl2·4(H2O) R 3m 3 2/m
Help on  Strunz Class: Strunz Class: IV/F.05-15 IV - Oxides
  IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure
  IV/F.05 - Meixnerite - Muskoxite series
 
IV/F.05-10 Meixnerite Mg6Al2(OH)18·4(H2O) R 3m 3 2/m
 
IV/F.05-15 Woodallite Mg6Cr2(OH)16Cl2·4(H2O) R 3m 3 2/m
 
IV/F.05-20 Iowaite Mg4Fe(OH)8OCl·2-4(H2O) R 3m 3 2/m
 
IV/F.05-30 Muskoxite Mg7Fe4O13·10(H2O) Unk (pseudo HEX-R) Trig
 

Other Woodallite Information

Help on References: References: NAME( AmMin, Vol 87, p 182) PHYS. PROP.(AmMin, Vol 87, p 182) OPTIC PROP.(AmMin, Vol 87, p 182)
Help on See Also: See Also: Links to other databases for Woodallite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

Search for Woodallite using:

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

Visit our Advertisers for Woodallite :
AA Mineral Specimens
B and L Minerals
Crystal Vaults
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Woodallite Mineral Data :

Ask about Woodallite 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 Woodallite Specimen Label here :

Woodallite

Mg6Cr2(OH)16Cl2·4(H2O)
Dana No: 6.4.5.2 Strunz No: IV/F.05-15
Locality:

 

Notes:

 

 
   
 
Go To Webmineral Home Crystallography X-Ray D-Spacing Table Chemical Composition
Dana Classification Strunz Classification Table of Mineral Properties Alphabetical Listing of Minerals
Search Webmineral Photo Gallery of Mineral Images Help Files Links