Mountkeithite Mineral Data + 
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- 32.4.3.1 Mountkeithite (Mg,Ni)11(Fe,Cr)3(SO4,CO3)3.5(OH)24·11(H2O) Unk Hex
- VI/D.09-10 Honessite Ni6Fe2(SO4)(OH)16·4(H2O) R 3m 3 2/m
- VI/D.09-20 Hydrohonessite Ni6Fe2(SO4)(OH)16·7(H2O) Unk Hex
- VI/D.09-30 Mountkeithite (Mg,Ni)11(Fe,Cr)3(SO4,CO3)3.5(OH)24·11(H2O) Unk Hex
General Mountkeithite Information |
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 Chemical Formula: |
(Mg,Ni)11(Fe+++,Cr)3(SO4,CO3)3.5(OH)24·11(H2O) | ||
| Composition: |
Molecular Weight = 1,558.37 gm | ||
| Magnesium 14.04 % Mg 23.28 % MgO | |||
| Chromium 3.34 % Cr 4.88 % Cr2O3 | |||
| Iron 7.17 % Fe 10.25 % Fe2O3 | |||
| Nickel 7.53 % Ni 9.59 % NiO | |||
| Hydrogen 3.62 % H 32.37 % H2O | |||
| Carbon 1.16 % C 4.24 % CO2 | |||
| Sulfur 4.12 % S 10.28 % SO3 | |||
| Oxygen 59.03 % O | |||
| ______ ______ | |||
| 100.00 % 94.87 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mg9Ni2Fe3+2Cr(SO4)2(CO3)1.5(OH)34·11(H2O) | ||
| Environment: |
Bleached serpentinite matrix. | ||
| IMA Status: |
Approved IMA 1981 | ||
| Locality: |
Mount Keith nickel deposit, 400 km nnw of Kalgooolie, WA, Australia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
Mountkeithite Image | |||
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Images:
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Mountkeithite Crystallography |
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| Axial Ratios: |
a:c = 1:2.1074 | ||
| Cell Dimensions: |
a = 10.698, c = 22.545, Z = 2; V = 2,234.53 Den(Calc)= 2.32 | ||
| Crystal System: |
HexagonalSpace Group: Unk | ||
| X Ray Diffraction: |
By Intensity(I/Io): 11.3(1), 5.63(0.8), 3.765(0.6), | ||
Physical Properties of Mountkeithite |
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| Cleavage: |
[0001] Perfect | ||
| Color: |
White, Light pink. | ||
| Density: |
2.12 | ||
| Habit: |
Flakes - Flat, thin crystals or aggregates. | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Habit: |
Rosette - Bundled tabular aggregates resembling rose flower petals. | ||
| Hardness: |
2 - Gypsum | ||
| Luster: |
Pearly | ||
| Streak: |
white | ||
Optical Properties of Mountkeithite |
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| Gladstone-Dale: |
CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.101 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.222,KPDmeas= 0.2429,KC= 0.247 |
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| Optical Data: |
Uniaxial (-), e=1.51, w=1.52, bire=0.0100. | ||
Calculated Properties of Mountkeithite |
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| Electron Density: |
relectron=2.17 gm/cc |
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| Fermion Index |
Fermion Index = 0.0203 Boson Index = 0.9797 |
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| Photoelectric: |
PEMountkeithite = 6.31 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Mountkeithite is Not Radioactive |
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Mountkeithite Classification |
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| Dana Class: |
32.4.3.1 (32)Compound Sulfates | ||
| (32.4)(hydrous) with poly-anionic formula | |||
| (32.4.3)Dana Group | |||
| Strunz Class: |
VI/D.09-30 VI - Sulfates,Chromates,Molybdates and Tungstates | ||
| VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size | |||
| VI/D.09 - Honessite - Mountkeithite series | |||
Other Mountkeithite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Mountkeithite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Mountkeithite using: Visit our Advertisers for Mountkeithite : Translate Mountkeithite Mineral Data : Ask about Mountkeithite here : Print or Cut-and-Paste your Mountkeithite Specimen Label here :
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