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Mountkeithite

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About MountkeithiteHide

Formula:
[(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2O
(x < 0.5, n > 3x/2)
Colour:
Pale pink, white
Lustre:
Pearly
Hardness:
2
Specific Gravity:
2.12
Crystal System:
Hexagonal
Name:
Named by D.R. Hudson and M. Bussell after Mount Keith, Australia which includes the type locality. The mineral name was submitted to the IMA in 1977 and accepted in 1980 in a slightly modified form.
Usually found as a white to pink coating in vughs in weathered serpentine.


Classification of MountkeithiteHide

Approved
Approval Year:
1980
First Published:
1981
7.DD.35

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
32.4.3.1

32 : COMPOUND SULFATES
4 : Hydrated Compound Sulfates containing Hydroxyl or Halogen
12.2.23

12 : Carbonates with other anions
2 : Carbonates with sulphate

Physical Properties of MountkeithiteHide

Pearly
Transparency:
Translucent
Colour:
Pale pink, white
Hardness:
Density:
2.12 g/cm3 (Measured)    1.95 g/cm3 (Calculated)

Optical Data of MountkeithiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.520 nε = 1.510
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of MountkeithiteHide

Formula:
[(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2O

(x < 0.5, n > 3x/2)
IMA Formula:
(Mg1-xFe3+x)(SO4)x/2(OH)2 · nH2O (x < 0.5, n > 3x/2)

Crystallography of MountkeithiteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 10.69 Å, c = 22.54 Å
Ratio:
a:c = 1 : 2.109
Unit Cell V:
2,230.69 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.30 (100)
5.63 (80)
3.765 (60)
2.645 (40)
2.545 (40)
1.554 (50)
1.505 (30)

Type Occurrence of MountkeithiteHide

General Appearance of Type Material:
Friable aggregates and rosettes composed of soft flakes.
Place of Conservation of Type Material:
Western Australian Museum, Perth, Australia, M72.1991.
The Natural History Museum, London, England.
Geological Setting of Type Material:
Low-temperature hydrothermal vein in a nickel deposit.

Synonyms of MountkeithiteHide

Other Language Names for MountkeithiteHide

Relationship of Mountkeithite to other SpeciesHide

Other Members of this group:
Carrboydite(Ni1-xAlx)(SO4)x/2(OH)2 · nH2OHex.
Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2OHex.
Hydrohonessite(Ni1-xFe3+x)(OH)2(SO4)x/2 · nH2OHex.
ZincaluminiteZn6Al6(SO4)2(OH)16 · 5H2O

Common AssociatesHide

Associated Minerals Based on Photo Data:
Artinite1 photo of Mountkeithite associated with Artinite on mindat.org.
Serpentine Subgroup1 photo of Mountkeithite associated with Serpentine Subgroup on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.DD.05FelsőbányaiteAl4(SO4)(OH)10 · 4H2OMon. 2 : P21
7.DD.10LangiteCu4(SO4)(OH)6 · 2H2OMon. m
7.DD.10PosnjakiteCu4(SO4)(OH)6 · H2OMon. m : Pm
7.DD.10WroewolfeiteCu4(SO4)(OH)6 · 2H2OMon. m : Pm
7.DD.15SpangoliteCu6Al(SO4)(OH)12Cl · 3H2OTrig. 3m : P3 1c
7.DD.20KtenasiteZn(Cu,Zn)4(SO4)2(OH)6 · 6H2OMon.
7.DD.25ChristeliteCu2Zn3(SO4)2(OH)6 · 4H2OTric.
7.DD.30CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2OMon.
7.DD.30DevillineCaCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
7.DD.30OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2OOrth. mm2 : Pca21
7.DD.30SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2OMon. 2/m : B2/b
7.DD.30NiedermayriteCdCu4(SO4)2(OH)6 · 4H2OMon. 2/m : P21/m
7.DD.30EdwardsiteCu3Cd2(SO4)2(OH)6·4H2O Mon. 2/m : P21/b
7.DD.35Carrboydite(Ni1-xAlx)(SO4)x/2(OH)2 · nH2OHex.
7.DD.35Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2OHex.
7.DD.35Honessite(Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2OTrig.
7.DD.35Hydrohonessite(Ni1-xFe3+x)(OH)2(SO4)x/2 · nH2OHex.
7.DD.35MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2OTrig. 3m (3 2/m) : R3m
7.DD.35ShigaiteMn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.
7.DD.35WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2OTrig. 3m (3 2/m) : P3c1
7.DD.35WoodwarditeCu1-xAlx(OH)2(SO4)x/2 · nH2OTrig. 3m (3 2/m) : R3m
7.DD.35ZincaluminiteZn6Al6(SO4)2(OH)16 · 5H2O
7.DD.35Hydrowoodwardite(Cu1-xAlx)(OH)2[SO4]x/2 · nH2OTrig. 3m (3 2/m) : R3m
7.DD.35ZincowoodwarditeZn1-xAlx(OH)2[SO4]x/2 · nH2OTrig.
7.DD.35NatroglaucoceriniteZn6Al3(OH)18[Na(H2O)6](SO4)2•6H2OHex.
7.DD.35NikischeriteFe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2OTrig.
7.DD.40Lawsonbauerite(Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2OMon. 2/m : P21/b
7.DD.40Torreyite(Mg,Mn2+)72Mn2+2Zn4(SO4)2(OH)22 · 8H2OMon. 2/m : P21/b
7.DD.45MooreiteMg92Mn2Zn4(SO4)2(OH)26 · 8H2OMon. 2/m : P2/b
7.DD.50NamuwiteZn4(SO4)(OH)6 · 4H2OTrig. 3 : P3
7.DD.55BechereriteZn7Cu(OH)13[(SiO(OH)3(SO4)]Trig. 3 : P3
7.DD.60Ramsbeckite(Cu,Zn)15(SO4)4(OH)22 · 6H2OMon. 2/m
7.DD.65VonbezingiteCa6Cu3(SO4)3(OH)12 · 2H2OMon. 2/m : P21/b
7.DD.70RedgilliteCu6(SO4)(OH)10 · H2OMon. 2/m : P21/b
7.DD.75ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2OMon. 2 : P21
7.DD.75Nickelalumite(Ni,Cu)Al4(SO4,(NO3)2)(OH)12 · 3H2OMon.
7.DD.75KyrgyzstaniteZnAl4(SO4)(OH)12·3H2OMon.
7.DD.80GuarinoiteZn6(SO4)(OH)10 · 5H2OHex.
7.DD.80Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2OTrig.
7.DD.80ThérèsemagnaniteNaCo4(SO4)(OH)6Cl·6H2OHex.
7.DD.80UM1992-30-SO:CCuHZn(Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2OTrig. 3 : P3
7.DD.85MontetrisaiteCu6(SO4)(OH)10 · 2H2OOrth. mm2 : Cmc21

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

12.2.1BurkeiteNa6(CO3)(SO4)2Orth.
12.2.2HanksiteNa22K(SO4)9(CO3)2ClHex. 6/m : P63/m
12.2.3TychiteNa6Mg2(CO3)4(SO4)Iso. m3 (2/m 3) : Fd3
12.2.4MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2OTrig. 3m (3 2/m) : R3m
12.2.5FerrotychiteNa6(Fe,Mn,Mg)2(CO3)4(SO4)
12.2.6NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2OOrth.
12.2.7CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2OOrth.
12.2.8RapidcreekiteCa2(SO4)(CO3) · 4H2OOrth.
12.2.9TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2OOrth.
12.2.10Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2OTrig.
12.2.11LeadhillitePb4(CO3)2(SO4)(OH)2Mon. 2/m : P21/b
12.2.12MacphersonitePb4(CO3)2(SO4)(OH)2Orth. mmm (2/m 2/m 2/m)
12.2.13SusannitePb4(CO3)2(SO4)(OH)2Trig. 3 : P3
12.2.14WherryitePb7Cu2(SO4)4(SiO4)2(OH)2Mon. 2/m : B2/m
12.2.15CaledonitePb5Cu2(SO4)3(CO3)(OH)6Orth. mm2 : Pmn21
12.2.16NasledovitePbMn3Al4(CO3)4(SO4)O5 · 5H2O
12.2.17JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex.
12.2.18SchröckingeriteNaCa3(UO2)(CO3)3(SO4)F · 10H2OTric. 1 : P1
12.2.19ManganotychiteNa6Mn2(CO3)4(SO4)
12.2.20HauckiteFe3+3(Mg,Mn2+)24Zn18(SO4)4(CO3)2(OH)81Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
12.2.21ParaotwayiteNi(OH)2-x(SO4,CO3)0.5xMon.
12.2.22Carrboydite(Ni1-xAlx)(SO4)x/2(OH)2 · nH2OHex.
12.2.24CamérolaiteCu6Al3(OH)18(H2O)2[Sb(OH)6](SO4)Tric. 1 : P1

Other InformationHide

Notes:
soluble, with effervescence, in dilute HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MountkeithiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hudson, D.R., Bussell, M. (1981) Mountkeithite, a New Pyroaurite-Related Mineral with an Expanded Interlayer Containing Exchangeable MgSO4. Mineralogical Magazine: 44: 345-350.
Fleischer, M., Cabri, L.J., Chao, G.Y., Mandarino, J.A., Pabst, A. (1982) New mineral names. American Mineralogist: 67: 621-624.
Frost, R.L., Weier, M.L., Kloprogge, J.T. (2003) Raman spectroscopy of some natural hydrotalcites with sulphate and carbonate in the interlayer. Journal of Raman Spectroscopy: 34: 760-768.
Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine: 76: 1289-1336.

Internet Links for MountkeithiteHide

Localities for MountkeithiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Tasmania
    • West Coast municipality
      • Zeehan District
        • Dundas mineral field
Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
  • Western Australia
    • Wiluna Shire
      • Lake Way Station
Grguric, B.A., Seat, Z., Karpuzov, A.A., Simonov, O.N. (2013) The West Jordan deposit, a newly-discovered Type 2 dunite-hosted nickel sulphide system in the northern Agnew-Wiluna Belt, Western Australia. Ore Geology Reviews, Vol. 51, pg. 79-92
      • Mount Keith
MM 1981, 345-50
USA
 
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Goat Mountain
Steve Sorrell Collection
Mineral and/or Locality  
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