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N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa

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List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Cinnabar2.8.14.1HgS
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Marcasite2.12.2.1FeS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Bixbyite4.3.7.2Mn3+2O3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Diaspore6.1.1.1AlO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Groutite6.1.1.3Mn3+O(OH)
Lepidocrocite6.1.2.2γ-Fe3+O(OH)
Manganite6.1.3.1Mn3+O(OH)
X(OH)2
Brucite6.2.1.1Mg(OH)2
Portlandite6.2.1.4Ca(OH)2
Pyrochroite6.2.1.3Mn(OH)2
Group 7 - MULTIPLE OXIDES
AB2X4
Hausmannite7.2.7.1Mn2+Mn3+2O4
Jacobsite7.2.2.2Mn2+Fe3+2O4
Marokite7.2.10.1CaMn3+2O4
(AB)2X3
Braunite7.5.1.3Mn2+Mn3+6(SiO4)O8
'Braunite-II'7.5.1.3CaMn3+14(SiO4)O20
AB3X7
Todorokite7.8.1.1(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Group 12 - COMPOUND HALIDES
Miscellaneous
Creedite12.1.4.1Ca3SO4Al2F8(OH)2 · 2H2O
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Rhodochrosite14.1.1.4MnCO3
AB(XO3)2
Kutnohorite14.2.1.3Ca(Mn,Mg,Fe)(CO3)2
Group 25 - ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
Diborates
Sussexite25.2.1.1Mn2+BO2(OH)
Group 26 - HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
Pentaborates
Gowerite26.5.8.1Ca[B5O8(OH)][B(OH)3] · 3H2O
Group 27 - COMPOUND BORATES
Miscellaneous
Gaudefroyite27.1.2.1Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Celestine28.3.1.2SrSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq·xH2O, where m:p > 6:1
Shigaite ?31.1.2.1Mn6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
(AB)2(XO4)Zq·xH2O
Despujolsite31.7.6.1Ca3Mn4+(SO4)2(OH)6 · 3H2O
Miscellaneous
Ettringite31.10.2.1Ca6Al2(SO4)3(OH)12 · 26H2O
Group 32 - COMPOUND SULFATES
Hydrated Compound Sulfates containing Hydroxyl or Halogen
Charlesite ?32.4.4.1Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O
Jouravskite32.4.4.3Ca3Mn4+(SO4)(CO3)(OH)6 · 12H2O
Sturmanite32.4.4.2Ca6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
Thaumasite32.4.4.4Ca3(SO4)[Si(OH)6](CO3) · 12H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Tephroite51.3.1.4Mn2+2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Andradite51.4.3b.1Ca3Fe3+2(SiO4)3
Grossular51.4.3b.2Ca3Al2(SiO4)3
var: Hibschite51.4.3d.1Ca3Al2(SiO4)3-x(OH)4x
Henritermierite51.4.4.1Ca3(Mn3+,Al)2(SiO4)2(OH)4
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Leucophoenicite52.3.2c.2Mn2+7(SiO4)3(OH)2
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Afwillite52.4.7.1Ca3(HSiO4)2 · 2H2O
Bultfonteinite52.4.7.2Ca2(HSiO4)F · H2O
Mozartite52.4.2.1CaMn3+(SiO4)(OH)
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1Ca(HBSiO5)
Group 57 - SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
Insular Si3O10 and Larger Noncyclic Groups with [Si4O13] groups
Ruizite57.2.2.1Ca2Mn3+2[Si4O11(OH)2](OH)2·2H2O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Vesuvianite58.2.4.1(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Group 63 - CYCLOSILICATES Condensed Rings
Condensed Rings (Milarite - Osumilite group)
Sugilite63.2.1a.9K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Aegirine65.1.3c.2NaFe3+Si2O6
Diopside65.1.3a.1CaMgSi2O6
Nchwaningite (TL)65.1.8.1Mn2+2(SiO3)(OH)2 · H2O
Single-Width Unbranched Chains, W=1 with chains P=3
Bustamite65.2.1.2CaMn2+(Si2O6)
Pectolite65.2.1.4aNaCa2Si3O8(OH)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Richterite66.1.3b.9{Na}{NaCa}{Mg5}(Si8O22)(OH)2
Amphiboles - Ca-Na subgroup
Inesite66.3.3.1Ca2(Mn,Fe)7Si10O28(OH)2 · 5H2O
Xonotlite66.3.1.1Ca6(Si6O17)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Caryopilite71.1.2b.1Mn2+3Si2O5(OH)4
Guidottiite (TL)71.1.4.8Mn2Fe3+(Fe3+SiO5)(OH)4
Lizardite71.1.2b.2Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Glauconite71.2.2a.5(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Sheets of 6-membered rings with 2:1 clays
Saponite71.3.1b.2Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Gonyerite71.4.4.1(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Oyelite72.3.2.8Ca10Si8B2O29 · 12.5H2O
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-, 6-, and 12-membered rings
Friedelite72.4.1b.1Mn2+8Si6O15(OH,Cl)10
Group 73 - PHYLLOSILICATES Condensed Tetrahedral Sheets
Condensed Tetrahedral Sheets with double and single layers
Orlymanite73.2.2b.2Ca4Mn3Si8O20(OH)6 · 2H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 78 - Unclassified Silicates
Miscellaneous
Poldervaartite ?78.1.8.1CaCa[SiO3(OH)](OH)
Bementite78.5.2.1Mn7Si6O15(OH)8
Unclassified Minerals, Rocks, etc.
Aragonite-CaCO3
'Chlorite Group'-
Gageite-Mn21(Si4O12)2O3(OH)20
Hydroxyapophyllite-(K)-KCa4(Si8O20)(OH,F) · 8H2O
Kenotobermorite (TL)-[Ca4Si6O15(OH)2·2H2O]·3H2O
'Kenotobermorite-4O'-
Lavinskyite ?-K(Li,Cu,Mg,Na)2Cu6(Si4O11)2(OH)4
Manganvesuvianite (TL)-Ca19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9
Marshallsussmanite-NaCaMnSi3O8(OH)
Olmiite (TL)-CaMn2+[SiO3(OH)](OH)

References

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Hochleitner, R. (1986) Sturmanit und Ettringit aus den Kalahari-Manganfeldern. LAPIS 11 (10), 19-24.
Beukes, G.J., De Bruiyn, H. and Van der Westhuizen, W.A. (1993) Gaudefroyite from the Kalahari manganese field, South Africa. Neues Jahrbuch Mineralogie, Monatshefte, 385–392.
Gutzmer, J. (1994) Hydrothermale Alteration von Manganerzen der Nchwaning Mine, Kalahari Manganerzfeld, Suedafrika. Diploma dissertation (unpublished). Clausthal University of Technology, 158 pages.
Gutzmer, J. (1994) Hydrothermale Alteration von Manganerzen der Nchwaning Mine, Kalahari Manganerzfeld, Suedafrika. Mitteilungsblatt. Clausthal University of Technology, 53–54.
Cairncross, B., and Dixon, R. (1995) Minerals of South Africa. The Geological Society of South Africa, Linden 2014, RSA.
Nyfeler, D., Armbruster, T., Dixon, R. and Bermanec, V. (1995) Nchwaningite, Mn2+2SiO3(OH)2•H2O, a new pyroxene related chain silicate from the Nchwaning mine, Kalahari manganese field, South Africa. American Mineralogist, 80, 377–386.
Cairncross, B., Beukes, N. and Gutzmer, J. (1997) The Manganese Adventure – The South African Manganese Fields. Associated Ore & Metal Corporation Limited, Johannesburg, Republic of South Africa.
Cairncross, B., Tsikos, H. and Harris, C. (2000) Prehnite from the Kalahari manganese field, South Africa, and its possible implications. South African Journal of Geology, 103, 231–236.
Cairncross, B., Gutzmer, J. and Pretorius, A. (2002) Spektakulärer Neufund: Poldervaartit aus der N’Chwaning II-Mine, Kalahari, Südafrika. Lapis, 27, 30–34.
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa.
Bonazzi, P., Bindi, L., Medenbach, O., Pagano, R., Lampronti, Menchetti, S. (2007) Olmiite, CaMn[SiO3(OH)](OH), the Mn-dominant analogue of poldervaartite, a new mineral species from Kalahari manganese fields (Republic of South Africa), Mineralogical Magazine, 71, 193-291.
Cairncross, B., and Beukes, N. J., (2013) The Kalahari Manganese Field, the adventure continues. Struik Nature Publishers, Cape Town, South Africa.

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