Free State, South Africa (original) (raw)

Formula: NaFe3+Si2O6

Formula: MnS

Formula: Na(AlSi3O8)

References:

Hughes, H.S., Compton-Jones, C., McDonald, I., Kiseeva, E.S., Kamenetsky, V.S., Rollinson, G., Coggon, J.A., Kinnaird, J.A. and Bybee, G.M., (202). Base metal sulphide geochemistry of southern African mantle eclogites (Roberts Victor): Implications for cratonic mafic magmatism and metallogenesis. Lithos, 382, p.105918.

ⓘ Almandine

Formula: Fe2+3Al2(SiO4)3

Localities:

Description: Inclusions in diamonds.

ⓘ 'Amphibole Supergroup'

Formula: A B2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2

ⓘ Analcime

Formula: Na(AlSi2O6) · H2O

ⓘ Anatase

Formula: TiO2

Localities:

Carbon Leader reef, Free State, South Africa
Moab Khotsong Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Andalusite

Formula: Al2(SiO4)O

Localities:

Vredefort, Ngwathe Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Kroonstad, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa

ⓘ Ankerite

Formula: Ca(Fe2+,Mg)(CO3)2

ⓘ Anorthite

Formula: Ca(Al2Si2O8)

ⓘ Anorthite var. Bytownite

Formula: (Ca,Na)[Al(Al,Si)Si2O8]

ⓘ 'Apatite'

Formula: Ca5(PO4)3(Cl/F/OH)

Localities:

Beatrix Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Stukpan Complex, Fezile Dabi District Municipality, Free State, South Africa
Star Mine, Theunissen kimberlite field, Theunissen, Masilonyana Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Moab Khotsong Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa

ⓘ Aphthitalite

Formula: (K,Na)3Na(SO4)2

References:

Kamenetsky, V. S., Belousova, E. A., Giuliani, A., Kamenetsky, M. B., Goemann, K., & Griffin, W. L. (2014). Chemical abrasion of zircon and ilmenite megacrysts in the Monastery kimberlite: Implications for the composition of kimberlite melts. Chemical Geology, 383, 76-85.

ⓘ 'Apophyllite Group'

Formula: A B4[Si8O22]X · 8H2O

ⓘ Aragonite

Formula: CaCO3

ⓘ Armalcolite

Formula: (Mg,Fe2+)Ti2O5

ⓘ Arsenopyrite

Formula: FeAsS

ⓘ Augite

Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6

Localities:

Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ Augite var. Fassaite

Formula: (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]

ⓘ Baddeleyite

Formula: ZrO2

References:

ⓘ 'Banded ironstone'

ⓘ Baryte

Formula: BaSO4

Localities:

Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Vereeniging - Sasolburg coalfields, Fezile Dabi District Municipality, Free State, South Africa
Vaal Reefs Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa

ⓘ Baryte var. Cerian Barite

Formula: BaSO4

References:

**Dunn, Pete J., Gobel, Volker, Grice, Joel D., Puziewicz, Jacek, Shigley, James E., Vanko, David A., Zilczer, Janet (1985) New mineral names. American Mineralogist, 70 (3-4) 436-441 **p.439

ⓘ 'Biotite'

Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

ⓘ Bismuthinite

Formula: Bi2S3

ⓘ Bradleyite

Formula: Na3Mg(CO3)(PO4)

References:

ⓘ Brannerite

Formula: UTi2O6

ⓘ Bridgmanite

Formula: (Mg,Fe)SiO3

ⓘ Bultfonteinite

Formula: Ca2(HSiO4)F · H2O

ⓘ Calcite

Formula: CaCO3

Localities: Reported from at least 10 localities in this region.

ⓘ Calzirtite

Formula: Ca2Zr5Ti2O16

References:

ⓘ Catapleiite

Formula: Na2Zr(Si3O9) · 2H2O

References:

ⓘ Chalcopyrite

Formula: CuFeS2

Localities:

Stukpan Complex, Fezile Dabi District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Moab Khotsong Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa

ⓘ 'Chlorite Group'

Localities:

Beatrix Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Chromite

Formula: Fe2+Cr3+2O4

Localities: Reported from at least 6 localities in this region.

ⓘ Clinochlore

Formula: Mg5Al(AlSi3O10)(OH)8

Colour: Pale green

Description: Found associated with calcite and pyrite

ⓘ Clinoferrosilite

Formula: Fe2+2Si2O6

ⓘ 'Clinopyroxene Subgroup'

Localities:

Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Cobaltite

Formula: CoAsS

ⓘ Coesite

Formula: SiO2

Localities:

Vredefort, Ngwathe Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ Coffinite

Formula: U(SiO4) · nH2O

ⓘ Cooperite

Formula: PtS

ⓘ Cordierite

Formula: (Mg,Fe)2Al3(AlSi5O18)

ⓘ Corundum

Formula: Al2O3

Localities:

Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Crown Mine, Kroonstad, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ Cuprite

Formula: Cu2O

Description: Small amounts have been found along bedding planes in sandstone.

ⓘ Curite

Formula: Pb3(H2O)2[(UO2)4O4(OH)3]2

ⓘ Diamond

Formula: C

Localities: Reported from at least 14 localities in this region.

ⓘ Diopside

Formula: CaMgSi2O6

Localities:

Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ Diopside var. Chromium-bearing Diopside

Formula: Ca(Mg,Cr)Si2O6

ⓘ Dolomite

Formula: CaMg(CO3)2

References:

ⓘ Dyscrasite

Formula: Ag3Sb

References:

Anthony, John Williams, Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. (1990) Handbook of Mineralogy Vol. 1 - Elements, Sulfides, Sulfosalts. Mineral Data Publishing, Tucson, Arizona.

ⓘ Eitelite

Formula: Na2Mg(CO3)2

References:

ⓘ Enstatite

Formula: Mg2Si2O6

Localities:

Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ Enstatite var. Bronzite

Formula: (Mg,Fe2+)2[SiO3]2

ⓘ Epidote

Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)

Localities:

Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Free State Geduld Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Moab Khotsong Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa

ⓘ 'Fayalite-Forsterite Series'

Localities: Reported from at least 6 localities in this region.

ⓘ 'Florencite'

ⓘ Fluorapophyllite-(K)

Formula: KCa4(Si8O20)(F,OH) · 8H2O

ⓘ Freudenbergite

Formula: Na2(Ti,Fe)8O16

ⓘ Freudenbergite var. Ferrous freudenbergite

Formula: Na2(Ti,Fe)8O16

ⓘ Galena

Formula: PbS

Localities:

Carbon Leader reef, Free State, South Africa
St Helena Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Moab Khotsong Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa

ⓘ 'Garnet Group'

Formula: X3Z2(SiO4)3

Localities: Reported from at least 7 localities in this region.

ⓘ Geikielite

Formula: MgTiO3

ⓘ Gersdorffite

Formula: NiAsS

ⓘ Geversite

Formula: PtSb2

References:

ⓘ 'Glass'

ⓘ 'Glauconite'

Formula: K0.60-0.85(Fe3+,Mg,Al)2(Si,Al)4O10](OH)2

Description: Green inter-granular fillings in sandstone & shale directly above the coal seams.

ⓘ Gold

Formula: Au

Localities: Reported from at least 24 localities in this region.

ⓘ Gold var. Electrum

Formula: (Au,Ag)

References:

ⓘ Goldschmidtite (TL)

Formula: KNbO3

Type Locality:

References:

Meyer, N.A., Wenz, M.D., Walsh, J.P.S., Jacobsen, S.D., Locock, A.J., Harris, J.W. (2019) Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa. American Mineralogist: 104(9): 1345-1350.

ⓘ Graphite

Formula: C

Localities:

Beatrix Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Grossular

Formula: Ca3Al2(SiO4)3

ⓘ Gypsum

Formula: CaSO4 · 2H2O

ⓘ Halite

Formula: NaCl

References:

ⓘ 'Hornblende Root Name Group'

Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2

ⓘ 'Hypersthene'

Formula: (Mg,Fe)SiO3

ⓘ Ilmenite

Formula: Fe2+TiO3

Localities: Reported from at least 6 localities in this region.

ⓘ Iridium

Formula: (Ir,Os,Ru)

Localities:

Loraine Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
President Steyn Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
President Brand Mine, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Iridium var. Osmiridium

Formula: (Ir,Os,Ru)

Localities:

ⓘ Iron

Formula: Fe

Description: Ni-poor iron (Ni<1%) is associated with impact melt & found occasionally in matrix. May be derived from (foreign) projectiles.

ⓘ Iron var. Kamacite

Formula: (Fe,Ni)

Description: Kamacite (Fe-Ni Metal- 4-6% Ni - w. 1.5%Co)

ⓘ Isoferroplatinum

Formula: Pt3Fe

Localities: Reported from at least 6 localities in this region.

Description: Occurs in the Witwatersrand Reef.

ⓘ Kalsilite

Formula: KAlSiO4

References:

ⓘ Kassite

Formula: CaTi2O4(OH)2

References:

ⓘ 'K Feldspar'

Localities:

Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa
Otavi quarry, Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Khibinskite

Formula: K2ZrSi2O7

References:

ⓘ Kyanite

Formula: Al2(SiO4)O

Localities:

Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Vredefort, Ngwathe Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Crown Mine, Kroonstad, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Blaauwbosch Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa

ⓘ Lakargiite ?

Formula: Ca(Zr,Sn,Ti)O3

References:

ⓘ Lanarkite

Formula: Pb2(SO4)O

References:

Fuchs, S.H.J., Schumann, D., Williams-Jones, A.E., Murray, A.J., Couillard, M., Lagarec, K., Phaneuf, M.W., Vali, H. (2017): Gold and uranium concentration by interaction of immiscible fluids (hydrothermal and hydrocarbon) in the Carbon Leader Reef, Witwatersrand Supergroup, South Africa. Precambrian Research 293, 39-55.

ⓘ Laumontite

Formula: CaAl2Si4O12 · 4H2O

ⓘ Letovicite

Formula: (NH4)3H(SO4)2

ⓘ 'Leucoxene'

ⓘ Lindsleyite

Formula: (Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38

ⓘ Magnetite

Formula: Fe2+Fe3+2O4

ⓘ Majorite

Formula: Mg3(MgSi)(SiO4)3

ⓘ Mannardite

Formula: Ba(Ti4+6V3+2)O16

ⓘ Margarite

Formula: CaAl2(Al2Si2O10)(OH)2

ⓘ Mascagnite

Formula: (NH4)2SO4

ⓘ 'Maskelynite'

ⓘ Mathiasite (TL)

Formula: (Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12

Type Locality:

ⓘ Michenerite

Formula: PdBiTe

References:

ⓘ Millerite ?

Formula: NiS

References:

ⓘ Moissanite

Formula: SiC

Localities:

Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ 'Monazite'

Formula: REE(PO4)

Localities:

Bothaville, Nala Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Moab Khotsong Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa

ⓘ Mullite

Formula: Al4+2xSi2-2xO10-x

ⓘ Muscovite

Formula: KAl2(AlSi3O10)(OH)2

Localities: Reported from at least 6 localities in this region.

ⓘ Muscovite var. Illite

Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2

ⓘ Muscovite var. Sericite

Formula: KAl2(AlSi3O10)(OH)2

ⓘ Nahpoite

Formula: Na2(PO3OH)

References:

ⓘ Natrolite

Formula: Na2Al2Si3O10 · 2H2O

Localities:

Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Free State Geduld Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Bultfontein, Tswelopele Local Municipality, Lejweleputswa District Municipality, Free State, South Africa ? (more information)

ⓘ Nepheline

Formula: Na3K(Al4Si4O16)

References:

ⓘ 'Olivine Group'

Formula: M2SiO4

ⓘ Omphacite

Formula: (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6

Localities:

Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ 'Orthopyroxene Subgroup'

Localities:

Malvern meteorite, Mangaung Metropolitan Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

Description: Mg-rich Orthopyroxene

ⓘ Parakeldyshite

Formula: Na2ZrSi2O7

References:

ⓘ Pectolite

Formula: NaCa2Si3O8(OH)

ⓘ Pentlandite

Formula: (NixFey)Σ9S8

ⓘ Periclase

Formula: MgO

ⓘ Periclase var. Ferropericlase

Formula: (Mg,Fe)O

ⓘ Perovskite

Formula: CaTiO3

Localities:

Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Star Mine, Theunissen kimberlite field, Theunissen, Masilonyana Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

ⓘ Phlogopite

Formula: KMg3(AlSi3O10)(OH)2

Localities: Reported from at least 9 localities in this region.

ⓘ Pigeonite

Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6

ⓘ Pitiglianoite

Formula: Na6K2(Al6Si6O24)(SO4) · 2H2O

References:

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi2]O8

Localities:

Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Malvern meteorite, Mangaung Metropolitan Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa
Otavi quarry, Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa

ⓘ Priderite

Formula: K(Ti4+7Fe3+)O16

Localities:

Star Mine, Theunissen kimberlite field, Theunissen, Masilonyana Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa

ⓘ Pyrite

Formula: FeS2

Localities: Reported from at least 13 localities in this region.

ⓘ Pyrite var. Bravoite

Formula: (Fe,Ni)S2

ⓘ 'Pyrobitumen'

References:

ⓘ 'Pyrobitumen var. Thucholite'

ⓘ Pyrope

Formula: Mg3Al2(SiO4)3

Localities:

Monastery Mine, Clocolan, Setsoto Local Municipality, Thabo Mofutsanyane District Municipality, Free State, South Africa
Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

Description: Inclusions in diamonds.

ⓘ Pyrophyllite

Formula: Al2Si4O10(OH)2

Localities: Reported from at least 7 localities in this region.

ⓘ 'Pyroxene Group'

Formula: ADSi2O6

ⓘ Pyrrhotite

Formula: Fe1-xS

ⓘ Quartz

Formula: SiO2

Localities: Reported from at least 18 localities in this region.

ⓘ Quartz var. Agate

ⓘ Rectorite

Formula: (Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O

ⓘ Rutile

Formula: TiO2

Localities:

Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Beatrix Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Salammoniac

Formula: NH4Cl

ⓘ Sanidine

Formula: K(AlSi3O8)

ⓘ 'Silica'

ⓘ Sillimanite

Formula: Al2(SiO4)O

ⓘ Silver

Formula: Ag

ⓘ Sodalite

Formula: Na4(Si3Al3)O12Cl

References:

ⓘ Sphalerite

Formula: ZnS

ⓘ Spinel

Formula: MgAl2O4

Localities:

Jagersfontein Mine, Jagersfontein, Kopanong Local Municipality, Xhariep District Municipality, Free State, South Africa
Rovic Mine, Boshof, Tokologo Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Star Mine, Theunissen kimberlite field, Theunissen, Masilonyana Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Vredefort impact structure, Fezile Dabi District Municipality, Free State, South Africa

ⓘ Staurolite

Formula: Fe2+2Al9Si4O23(OH)

ⓘ Stibiopalladinite

Formula: Pd5Sb2

ⓘ Stibnite

Formula: Sb2S3

References:

ⓘ Stishovite

Formula: SiO2

ⓘ Sudburyite

Formula: PdSb

References:

ⓘ Sudoite

Formula: Mg2Al3(Si3Al)O10)(OH)8

ⓘ Sylvite

Formula: KCl

References:

ⓘ Taenite

Formula: (Fe,Ni)

Description: Taenite sometimes present in Kamacite-taenite intergrowths

ⓘ Talc

Formula: Mg3Si4O10(OH)2

References:

ⓘ Tetraferriphlogopite

Formula: KMg3(Fe3+Si3O10)(OH,F)2

References:

ⓘ 'Tetrahedrite Subgroup'

Formula: Cu6(Cu4C2+2)Sb4S12S

ⓘ Thénardite

Formula: Na2SO4

References:

ⓘ Thomsonite-Ca

Formula: NaCa2[Al5Si5O20] · 6H2O

ⓘ Titanite

Formula: CaTi(SiO4)O

Localities:

ⓘ 'Tourmaline'

Formula: A D3G6 (T6O18)(BO3)3X3Z

ⓘ Troilite

Formula: FeS

Description: very fine-grained

ⓘ Tučekite

Formula: Ni9Sb2S8

References:

ⓘ 'UM1973-17-S:FeNi'

Formula: (Fe,Ni)9S11

ⓘ 'UM1973-18-S:FeNi'

Formula: (Fe,Ni)9S11

ⓘ 'UM1984-36-SiO:CaNaZr'

Formula: ~(Zr,Na,Ca)3Si6O17

References:

**Dunn, Pete J., Gobel, Volker, Grice, Joel D., Puziewicz, Jacek, Shigley, James E., Vanko, David A., Zilczer, Janet (1985) New mineral names. American Mineralogist, 70 (3-4) 436-441 **p.439

ⓘ 'UM1986-22-O:BaCeFeKTiV'

Formula: (K,Ba)3(Fe,V,Ce)3Ti14O32

ⓘ Uraninite

Formula: UO2

Localities:

Welkom Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa
Carbon Leader reef, Free State, South Africa
Moab Khotsong Mine, Moqhaka Local Municipality, Fezile Dabi District Municipality, Free State, South Africa
Western Holdings 1 Mine, Welkom, Matjhabeng Local Municipality, Lejweleputswa District Municipality, Free State, South Africa

ⓘ Vaesite ?

Formula: NiS2

References:

ⓘ Violarite ?

Formula: Fe2+Ni3+2S4

References:

ⓘ Vivianite

Formula: Fe2+Fe2+2(PO4)2 · 8H2O

ⓘ Witherite

Formula: BaCO3

References:

ⓘ Zemkorite

Formula: Na2Ca(CO3)2

References:

ⓘ Zircon

Formula: Zr(SiO4)

Localities: Reported from at least 7 localities in this region.

ⓘ Zirkelite

Formula: (Ti,Ca,Zr)O2-x

References: