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Mountkeithite Mineral Data

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General Mountkeithite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Ni)11(Fe+++,Cr)3(SO4,CO3)3.5(OH)24•11(H2O)
Help on Composition: Composition: Molecular Weight = 1,426.01 gm
   Magnesium  18.34 %  Mg   30.41 % MgO
   Aluminum    1.34 %  Al    2.54 % Al2O3
   Chromium    4.01 %  Cr    5.86 % Cr2O3
   Iron        5.56 %  Fe    7.95 % Fe2O3
   Copper      0.09 %  Cu    0.11 % CuO
   Nickel      4.61 %  Ni    5.87 % NiO
   Hydrogen    3.28 %  H    29.35 % H2O
   Carbon      1.02 %  C     3.73 % CO2
   Sulfur      5.67 %  S    14.15 % SO3
   Oxygen     56.08 %  O
             ______        ______ 
             100.00 %       99.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg10.76(OH)26.07•10.2(H2O)Ni1.12Cu0.02Fe3+1.42Cr1.1Al0.71(SO4)2.52(CO3)1.21
Help on Environment: Environment: Bleached serpentinite matrix.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Mount Keith nickel deposit, 400 km nnw of Kalgooolie, WA, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Mountkeithite + Pronunciation Say MOUNTKEITHITE
 

Mountkeithite Image

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  Mountkeithite

Comments: Pinkish mountkeithite grain in matrix.
Location: Mount Keith nickel deposit, Western Australia, Australia. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Mountkeithite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.1074
Help on Cell Dimensions: Cell Dimensions: a = 10.698, c = 22.545, Z = 2; V = 2,234.53 Den(Calc)= 2.12
Help on Crystal System: Crystal System: Hexagonal Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.3(1), 5.63(0.8), 3.765(0.6),
 

Physical Properties of Mountkeithite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: White, Light pink.
Help on Density: Density: 2.12
Help on Habit: Habit: Flakes - Flat, thin crystals or aggregates.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Mountkeithite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2429,KPDmeas= 0.2429,KC= 0.2514
Ncalc = 1.53
Help on Optical Data: Optical Data: Uniaxial (-), e=1.51, w=1.52, bire=0.0100.
 

Calculated Properties of Mountkeithite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.16 gm/cc
note: Specific Gravity of Mountkeithite =2.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMountkeithite = 5.12 barns/electron
U=PEMountkeithite x rElectron Density= 11.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mountkeithite is Not Radioactive
 

Mountkeithite Classification

Help on  Dana Class: Dana Class: 32.04.03.01 (32)Compound Sulfates
  (32.04)(hydrous) with poly-anionic formula
  (32.04.03)Dana Group
 
32.04.03.01 Mountkeithite (Mg,Ni)11(Fe,Cr)3(SO4,CO3)3.5(OH)24•11(H2O) Unk Hex
Help on  Strunz Class: Strunz Class: 07.DD.35 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DD -With only medium-sized cations; sheets of edge-sharing octahedra
 
07.DD.35 Carrboydite (Ni,Cu)14Al9(SO4,CO3)6(OH)43•7(H2O) Unk Hex
 
07.DD.35 Glaucocerinite (Zn,Cu)5Al3(SO4)1.5(OH)16•9(H2O) Unk (HEX-R) Trig
 
07.DD.35 Honessite Ni6Fe2(SO4)(OH)16•4(H2O) R 3m 3 2/m
 
07.DD.35 Hydrowoodwardite! Cu1-xAlx(OH)2(SO4)x/2•n(H2O)with0<x<0.67andn>3x/2 R 3m 3 2/m
 
07.DD.35 Zincowoodwardite! [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n] P 3- or R 3m 3
 
07.DD.35 Hydrohonessite Ni6Fe2(SO4)(OH)16•7(H2O) Unk Hex
 
07.DD.35 Motukoreaite Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O) R 3m 3 2/m
 
07.DD.35 Mountkeithite (Mg,Ni)11(Fe,Cr)3(SO4,CO3)3.5(OH)24•11(H2O) Unk Hex
 
07.DD.35 Shigaite Mn7Al4(SO4)2(OH)22•8(H2O) R 3 3
 
07.DD.35 Natroglaucocerinite! (Na,Zn,Cu)10Al6(SO4)3(OH)32•18(H2O)? Unk
 
07.DD.35 Wermlandite (Ca,Mg)Mg7(Al,Fe)2(SO4)2(OH)18•12(H2O) P 3c1 3 2/m
 
07.DD.35 Nikischerite! NaFe6Al3(SO4)2(OH)18(H2O)12 R 3 3
 
07.DD.35 Zincaluminite Zn6Al6(SO4)2(OH)26•5(H2O) Unk Hex
 
07.DD.35 Woodwardite Cu4Al2(SO4)(OH)12•2-4(H2O) Unk Hex
 
07.DD.35 Zincowoodwardite-3R! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],0.32<x<0.50,n=0.59 R 3m 3 2/m
 
07.DD.35 Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],x=0.33,n.0.96 P 3 3
 

Other Mountkeithite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Mountkeithite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Mountkeithite Specimen Label here :

Mountkeithite

(Mg,Ni)11(Fe+++,Cr)3(SO4,CO3)3.5(OH)24•11(H2O)
Dana No: 32.04.03.01 Strunz No: 07.DD.35
Locality:

 

Notes:

 

 
   
 


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