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Postmasburg manganese field, Northern Cape Province, South Africa

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Detailed Mineral List:
Aegirine
Formula: NaFe3+Si2O6
Reference: Minerals of South Africa
Localities: Recorded from at least 3 other localities in this region.
Akdalaite
Formula: 5Al2O3 · H2O
Description: ROM specimen M16225
Reference: Zhou, B., Sherriff, B. L., Taulelle, F., & Wu, G. (2003). Nuclear magnetic resonance study of Al: Si and F: OH order in zunyite. The Canadian Mineralogist, 41(4), 891-903.
Alabandite
Formula: MnS
Description: Reference given (Collection Elmar Lackner) is erroneous see http://www.mindat.org/mesg-7-152224.html. There is no manganese sulphides at Postmasburg as advised by Bruce Cairncross in personal communication. Debbie Woolf
Albite
Formula: Na(AlSi3O8)
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Amesite
Formula: Mg2Al(AlSiO5)(OH)4
Localities: Magoloring farm, Postmasburg manganese field, Northern Cape Province, South Africa
Bishop farm, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Japie's Rust, Postmasburg manganese field, Northern Cape Province, South Africa
Gamagara Ridge, Gloucester Farm, Postmasburg manganese field, Northern Cape Province, South Africa
'Amesite-2H1'
Formula: (Mg2Al)(SiAl)O5(OH)4
Habit: Small, hexagonal prisms
Colour: White to pale greenish-gray
Description: Occurring in clusters or disseminated in bixbyite ore
Reference: Zheng, H. & Bailey, S.W. (1997) Refinement of an amesite-2H1 polytype from Postmasburg,South Africa. Clays and Clay Minerals: 45(3): 301-310
'Apatite'
Locality: Doornfontein, Eastern belt, Postmasburg manganese field, Northern Cape Province, South Africa
Armbrusterite
Formula: K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Banalsite
Formula: Na2BaAl4Si4O16
Reference: Minerals of South Africa
Baryte
Formula: BaSO4
Localities: Reported from at least 9 localities in this region.
Birnessite
Formula: (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
Locality: Lohatlha Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Bixbyite
Formula: Mn3+2O3
Reference: Gaines (1991) Dana's New Mineralogy: The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana
Localities: Recorded from at least 10 other localities in this region.
Photo: © Elmar Lackner 2006. Bixbyite from Postmasburg manganese field, Northern Cape Province, South Africa
Bixbyite var: Sitaparite
Formula: Mn3+2O3
Locality: Gamagara Ridge, Gloucester Farm, Postmasburg manganese field, Northern Cape Province, South Africa
Braunite
Formula: Mn2+Mn3+6(SiO4)O8
Reference: Minerals of South Africa; Schaller W T, Carron M K, Fleischer M (1967) Ephesite, Na(LiAl2)(Al2Si2)O10(OH)2, a trioctahedral member of the margarite group, and related brittle micas, American Mineralogist, 52, 1689-1696
Localities: Recorded from at least 16 other localities in this region.
Calcite
Formula: CaCO3
Reference: Minerals of South Africa
'Chert'
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Eastern belt, Postmasburg manganese field, Northern Cape Province, South Africa
Manganore, Eastern belt, Postmasburg manganese field, Northern Cape Province, South Africa
Cryptomelane
Formula: K(Mn4+7Mn3+)O16
Reference: Minerals of South Africa
Localities: Recorded from at least 3 other localities in this region.
Diaspore
Formula: AlO(OH)
Reference: ; Minerals of South Africa; Schaller W T, Carron M K, Fleischer M (1967) Ephesite, Na(LiAl2)(Al2Si2)O10(OH)2, a trioctahedral member of the margarite group, and related brittle micas, American Mineralogist, 52, 1689-1696 ; Zhou, B., Sherriff, B. L., Taulelle, F., & Wu, G. (2003). Nuclear magnetic resonance study of Al: Si and F: OH order in zunyite. The Canadian Mineralogist, 41(4), 891-903.
Localities: Recorded from at least 10 other localities in this region.
Photo: © Elmar Lackner 2006. Diaspore from Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Diaspore var: Mangan-diaspore
Formula: AlO(OH)
Locality: Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Photo: © Leon Hupperichs. Mangan-diaspore from Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Ephesite
Formula: LiNaAl2(Al2Si2O10)(OH)2
Reference: ; Minerals of South Africa; Schaller W T, Carron M K, Fleischer M (1967) Ephesite, Na(LiAl2)(Al2Si2)O10(OH)2, a trioctahedral member of the margarite group, and related brittle micas, American Mineralogist, 52, 1689-1696
Localities: Recorded from at least 8 other localities in this region.
Photo: © specimen collection and photo Peter Kohorst. Ephesite from Gamagara Ridge, Gloucester Farm, Postmasburg manganese field, Northern Cape Province, South Africa
'Feldspar Group'
Locality: Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Gamagarite (TL)
Formula: Ba2Fe3+(VO4)2(OH)
Type Locality: Gamagara Ridge, Gloucester Farm, Postmasburg manganese field, Northern Cape Province, South Africa
Reference: Amer.Min.(1943) 28, 329-335; The Manganese Adventure: The South African Manganese Fields
Localities: Recorded from at least 1 other locality in this region.
Gibbsite
Formula: Al(OH)3
Reference: Minerals of South Africa
Goethite
Formula: α-Fe3+O(OH)
Localities: Eastern belt, Postmasburg manganese field, Northern Cape Province, South Africa
Paling farm, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Aucampsrust, Eastern Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Doornfontein, Eastern belt, Postmasburg manganese field, Northern Cape Province, South Africa
Kapstewel, Eastern belt, Postmasburg manganese field, Northern Cape Province, South Africa
Hausmannite
Formula: Mn2+Mn3+2O4
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Paling farm, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Aucampsrust, Eastern Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Photo: Hausmannite from Postmasburg manganese field, Northern Cape Province, South Africa
Hematite
Formula: Fe2O3
Reference: Minerals of South Africa
Localities: Recorded from at least 15 other localities in this region.
Photo: © Uwe Kolitsch. Hematite from Sishen Mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Hematite var: Specularite
Formula: Fe2O3
Locality: Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Hydroxylapatite
Formula: Ca5(PO4)3(OH)
Locality: Gamagara Ridge, Gloucester Farm, Postmasburg manganese field, Northern Cape Province, South Africa
Kaolinite
Formula: Al2(Si2O5)(OH)4
Localities: Paling farm, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Kentrolite
Formula: Pb2Mn3+2(Si2O7)O2
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
'K Feldspar'
Reference: Costin, G., Fairey, B., Tsikos, H., Gucsik, A. (2015): Tokyoite, As-Rich Tokyoite, and Noélbensonite: New Occurrences From the Postmasburg Manganese Field, Northern Cape Province, South Africa. The Canadian Mineralogist: 53: 981-990
Localities: Recorded from at least 1 other locality in this region.
Lithiophorite
Formula: (Al,Li)MnO2(OH)2
Reference: Minerals of South Africa
Localities: Recorded from at least 9 other localities in this region.
Photo: © Maggie Wilson. Lithiophorite from Gloucester mine, Gloucester Farm, Postmasburg manganese field, Northern Cape Province, South Africa
'Manganese'
Formula: Mn
Locality: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Manganite
Formula: Mn3+O(OH)
Reference: Minerals of South Africa
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Localities: Reported from at least 8 localities in this region.
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Localities: Reported from at least 8 localities in this region.
Noelbensonite
Formula: BaMn3+2(Si2O7)(OH)2 · H2O
Reference: Costin, G., Fairey, B., Tsikos, H., Gucsik, A. (2015): Tokyoite, As-Rich Tokyoite, and Noélbensonite: New Occurrences From the Postmasburg Manganese Field, Northern Cape Province, South Africa. The Canadian Mineralogist: 53: 981-990
Localities: Recorded from at least 1 other locality in this region.
Norrishite
Formula: KLiMn3+2(Si4O10)O2
Localities: Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa ? (more information)
Opal
Formula: SiO2 · nH2O
Reference: Minerals of South Africa
'Partridgeite'
Formula: Mn2O3
Reference: Economic Geology (1996) 91:1435-1454
Localities: Recorded from at least 9 other localities in this region.
'Psilomelane'
Reference: Minerals of South Africa
Localities: Recorded from at least 11 other localities in this region.
Pyrolusite
Formula: MnO2
Reference: Minerals of South Africa
Localities: Recorded from at least 12 other localities in this region.
Pyrophyllite
Formula: Al2Si4O10(OH)2
Reference: Minerals of South Africa
Localities: Recorded from at least 1 other locality in this region.
Quartz
Formula: SiO2
Localities: Reported from at least 11 localities in this region.
Ramsdellite
Formula: Mn4+O2
Reference: Minerals of South Africa
Localities: Recorded from at least 1 other locality in this region.
Romanèchite
Formula: (Ba,H2O)2(Mn4+,Mn3+)5O10
Localities: Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Bishop farm, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Rutile
Formula: TiO2
Reference: Zhou, B., Sherriff, B. L., Taulelle, F., & Wu, G. (2003). Nuclear magnetic resonance study of Al: Si and F: OH order in zunyite. The Canadian Mineralogist, 41(4), 891-903.
Localities: Recorded from at least 1 other locality in this region.
Serandite
Formula: NaMn2+2Si3O8(OH)
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Strontianite
Formula: SrCO3
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Sugilite
Formula: K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Localities: Borehole AKH49, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
Tokyoite
Formula: Ba2Mn3+(VO4)2(OH)
Reference: Costin, G., Fairey, B., Tsikos, H., Gucsik, A. (2015): Tokyoite, As-Rich Tokyoite, and Noélbensonite: New Occurrences From the Postmasburg Manganese Field, Northern Cape Province, South Africa. The Canadian Mineralogist: 53: 981-990
Localities: Recorded from at least 1 other locality in this region.
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Locality: Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
'Unnamed (possible ordered As-analogue of Tokyoite)'
Formula: Ba2Mn[(As,V)O4]2(OH)
Reference: Costin, G., Fairey, B., Tsikos, H., Gucsik, A. (2015): Tokyoite, As-Rich Tokyoite, and Noélbensonite: New Occurrences From the Postmasburg Manganese Field, Northern Cape Province, South Africa. The Canadian Mineralogist: 53: 981-990
Witherite
Formula: BaCO3
Reference: Costin, G., Fairey, B., Tsikos, H., Gucsik, A. (2015): Tokyoite, As-Rich Tokyoite, and Noélbensonite: New Occurrences From the Postmasburg Manganese Field, Northern Cape Province, South Africa. The Canadian Mineralogist: 53: 981-990
Localities: Recorded from at least 3 other localities in this region.
Zircon
Formula: Zr(SiO4)
Locality: Glosam Mine, Western Belt, Postmasburg manganese field, Northern Cape Province, South Africa
Zunyite
Formula: Al13Si5O20(OH,F)18Cl
Reference: Minerals of South Africa; Zhou, B., Sherriff, B. L., Taulelle, F., & Wu, G. (2003). Nuclear magnetic resonance study of Al: Si and F: OH order in zunyite. The Canadian Mineralogist, 41(4), 891-903.
Localities: Recorded from at least 3 other localities in this region.
Photo: Zunyite from Postmasburg manganese field, Northern Cape Province, South Africa

References

Economic Geology (1996): 91: 1414-1434.

Cairncross, B, Beukes, N, Gutzmer, J (1997): The Manganese Adventure

Mineralogical Magazine (1997): 61: 213-231.

Gutzmer, J. (1996). Genesis and alteration of the Kalahari and Postmasburg manganese deposits, Griqualand West, South Africa (Doctoral dissertation, Rand Afrikaans University).

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