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Jagersfontein Mine, Jagersfontein, Xhariep District, Free State Province, South Africa

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Latitude & Longitude (WGS84): 29° 45' 55'' South , 25° 25' 8'' East
Latitude & Longitude (decimal): -29.76528,25.41889
GeoHash:G#: kddndmmkx
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate


A diamond mine in a kimberlite pipe, owned by De Beers. Diamonds were first found at Jagersfontein farm in 1870, but it took until 1878 to recognize that this occurrence was indeed a pipe. It was first worked from an open pit, because the presence of a thick dolerite sheet made the side walls much more stable than those at Kimberley or Koffiefontein. Underground mining only commenced in 1910. The mine was worked almost continuously until 1971, except for two short periods of time during the 1930s depression and the Second World War. Its final closure was due to a decreasing diamond grade and increasing mining costs at greater depths.

Jagersfontein mine produced diamonds of extremely high quality, but the diamond grades were very low. It also produced a number of the world's largest diamonds, among them the 971.75 ct Excelsior and the 640 ct Jubilee (previously named Reitz). Among researchers, the deposit is known as a prime locality for mantle xenoliths, some of which are interpreted to have been derived from 300-500 km depths.

Located 2½ miles from Jagersfontein.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


25 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

Armalcolite
Formula: (Mg,Fe2+)Ti2O5
Reference: Minerals of South Africa
Baryte
Formula: BaSO4
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Baryte var: Cerian Barite
Formula: BaSO4
Reference: Haggerty, S.E. (1984): The mineral chemistry of new titanates from the Jagersfontein kimberlite, South Africa: Implications for metasomatism in the upper mantle. Geochim. Cosmochim. Acta: 47: 1833-1854; in: Dunn, P.J., Volker, G., Grice, J.D., Jambor, J.L., Puziewicz, J., Shigley, J.E., Vanko, D.A., Zilczer, J.A. (1985): New mineral Names. American Mineralogist: 70: 439
Bultfonteinite
Formula: Ca2(HSiO4)F · H2O
Reference: Parry J, Williams A F, Wright F E (1932) On bultfonteinite, a new fluorine-bearing hydrous calcium silicate from South Africa. Mineralogical Magazine 23, 145-162; Minerals of South Africa
Chromite
Formula: Fe2+Cr3+2O4
Reference: Tsai, H. M., Meyer, H. O., Moreau, J., & Milledge, H. J. (1979). Mineral inclusions in diamond: premier, Jagersfontein and Finsch kimberlites, South Africa, and Williamson mine, Tanzania. Kimberlites, Diatremes, and Diamonds: Their Geology, Petrology, and Geochemistry, 16-26.
Corundum
Formula: Al2O3
Reference: Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Contributions to Mineralogy and Petrology 26, 75-123.
Diamond
Formula: C
Reference: Dana 7:I:150.
Diopside
Formula: CaMgSi2O6
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983); Tsai, H. M., Meyer, H. O., Moreau, J., & Milledge, H. J. (1979). Mineral inclusions in diamond: premier, Jagersfontein and Finsch kimberlites, South Africa, and Williamson mine, Tanzania. Kimberlites, Diatremes, and Diamonds: Their Geology, Petrology, and Geochemistry, 16-26.
Enstatite
Formula: MgSiO3
Reference: Tsai, H. M., Meyer, H. O., Moreau, J., & Milledge, H. J. (1979). Mineral inclusions in diamond: premier, Jagersfontein and Finsch kimberlites, South Africa, and Williamson mine, Tanzania. Kimberlites, Diatremes, and Diamonds: Their Geology, Petrology, and Geochemistry, 16-26.
'Fayalite-Forsterite Series'
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983); Tsai, H. M., Meyer, H. O., Moreau, J., & Milledge, H. J. (1979). Mineral inclusions in diamond: premier, Jagersfontein and Finsch kimberlites, South Africa, and Williamson mine, Tanzania. Kimberlites, Diatremes, and Diamonds: Their Geology, Petrology, and Geochemistry, 16-26.
Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Reference: Minerals of South Africa
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Contributions to Mineralogy and Petrology 26, 75-123.
Geikielite
Formula: MgTiO3
Reference: Minerals of South Africa
Graphite
Formula: C
Reference: Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Contributions to Mineralogy and Petrology 26, 75-123.
Ilmenite
Formula: Fe2+TiO3
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Lindsleyite
Formula: (Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Mathiasite (TL)
Formula: (K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: Minerals of South Africa
Pectolite
Formula: NaCa2Si3O8(OH)
Reference: Bruce Cairncross photo ID 697444, McGregor Museum, Kimberley, specimen
Perovskite
Formula: CaTiO3
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Pyrite
Formula: FeS2
Reference: Cairncross photo ID 738551
Pyrope
Formula: Mg3Al2(SiO4)3
Reference: Tsai, H. M., Meyer, H. O., Moreau, J., & Milledge, H. J. (1979). Mineral inclusions in diamond: premier, Jagersfontein and Finsch kimberlites, South Africa, and Williamson mine, Tanzania. Kimberlites, Diatremes, and Diamonds: Their Geology, Petrology, and Geochemistry, 16-26.
Quartz
Formula: SiO2
Reference: Rocks & Min.: 21:130.
Quartz var: Agate
Reference: Rocks & Min.: 21:130.
Rutile
Formula: TiO2
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Spinel
Formula: MgAl2O4
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
Thomsonite-Ca
Formula: NaCa2[Al5Si5O20] · 6H2O
Reference: Minerals of South Africa
Titanite
Formula: CaTi(SiO4)O
Reference: S.E. Haggerty, J.R. Smyth, A.J. Erlank, R.S. Rickard, R.V. Danchin: Amer. Mineral. 68:494-505 (1983)
'UM1984-36-SiO:CaNaZr'
Formula: ~(Zr,Na,Ca)3Si6O17
Reference: Haggerty, S.E. (1984): The mineral chemistry of new titanates from the Jagersfontein kimberlite, South Africa: Implications for metasomatism in the upper mantle. Geochim. Cosmochim. Acta: 47: 1833-1854; in: Dunn, P.J., Volker, G., Grice, J.D., Jambor, J.L., Puziewicz, J., Shigley, J.E., Vanko, D.A., Zilczer, J.A. (1985): New mineral Names. American Mineralogist: 70: 439

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Diamond1.CB.10aC
Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Armalcolite4.CB.15(Mg,Fe2+)Ti2O5
Chromite4.BB.05Fe2+Cr3+2O4
Corundum4.CB.05Al2O3
Geikielite4.CB.05MgTiO3
Ilmenite4.CB.05Fe2+TiO3
Lindsleyite4.CC.40(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Mathiasite (TL)4.CC.40(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Perovskite4.CC.30CaTiO3
Quartz4.DA.05SiO2
var: Agate4.DA.05SiO2
Rutile4.DB.05TiO2
Spinel4.BB.05MgAl2O4
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
var: Cerian Barite7.AD.35BaSO4
Group 9 - Silicates
Bultfonteinite9.AG.80Ca2(HSiO4)F · H2O
Diopside9.DA.15CaMgSi2O6
Enstatite9.DA.05MgSiO3
Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Pectolite9.DG.05NaCa2Si3O8(OH)
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Pyrope9.AD.25Mg3Al2(SiO4)3
Thomsonite-Ca9.GA.10NaCa2[Al5Si5O20] · 6H2O
Titanite9.AG.15CaTi(SiO4)O
Unclassified Minerals, Rocks, etc.
Fayalite-Forsterite Series-
Garnet Group-X3Z2(SiO4)3
UM1984-36-SiO:CaNaZr-~(Zr,Na,Ca)3Si6O17

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Diamond1.3.6.1C
Graphite1.3.6.2C
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Geikielite4.3.5.2MgTiO3
Ilmenite4.3.5.1Fe2+TiO3
Perovskite4.3.3.1CaTiO3
AX2
Rutile4.4.1.1TiO2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Spinel7.2.1.1MgAl2O4
AB2X5
Armalcolite7.7.1.2(Mg,Fe2+)Ti2O5
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
AB21O38
Lindsleyite8.5.1.8(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Mathiasite (TL)8.5.1.7(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Pyrope51.4.3a.1Mg3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Bultfonteinite52.4.7.2Ca2(HSiO4)F · H2O
Titanite52.4.3.1CaTi(SiO4)O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Enstatite65.1.2.1MgSiO3
Single-Width Unbranched Chains, W=1 with chains P=3
Pectolite65.2.1.4aNaCa2Si3O8(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Fluorapophyllite-(K)72.3.1.1KCa4(Si8O20)(F,OH) · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
Baryte
var: Cerian Barite
-BaSO4
'Fayalite-Forsterite Series'-
'Garnet Group'-X3Z2(SiO4)3
Quartz
var: Agate
-SiO2
Thomsonite-Ca-NaCa2[Al5Si5O20] · 6H2O
'UM1984-36-SiO:CaNaZr'-~(Zr,Na,Ca)3Si6O17

List of minerals for each chemical element

HHydrogen
H BultfonteiniteCa2(HSiO4)F · H2O
H Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H PectoliteNaCa2Si3O8(OH)
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
CCarbon
C DiamondC
C GraphiteC
OOxygen
O Armalcolite(Mg,Fe2+)Ti2O5
O BaryteBaSO4
O BultfonteiniteCa2(HSiO4)F · H2O
O Baryte (var: Cerian Barite)BaSO4
O ChromiteFe2+Cr23+O4
O CorundumAl2O3
O DiopsideCaMgSi2O6
O EnstatiteMgSiO3
O Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
O Garnet GroupX3Z2(SiO4)3
O GeikieliteMgTiO3
O IlmeniteFe2+TiO3
O Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
O Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
O NatroliteNa2Al2Si3O10 · 2H2O
O PectoliteNaCa2Si3O8(OH)
O PerovskiteCaTiO3
O PhlogopiteKMg3(AlSi3O10)(OH)2
O PyropeMg3Al2(SiO4)3
O QuartzSiO2
O RutileTiO2
O SpinelMgAl2O4
O Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
O TitaniteCaTi(SiO4)O
O UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
FFluorine
F BultfonteiniteCa2(HSiO4)F · H2O
F Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Na NatroliteNa2Al2Si3O10 · 2H2O
Na PectoliteNaCa2Si3O8(OH)
Na Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Na UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
MgMagnesium
Mg Armalcolite(Mg,Fe2+)Ti2O5
Mg DiopsideCaMgSi2O6
Mg EnstatiteMgSiO3
Mg GeikieliteMgTiO3
Mg Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Mg Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg PyropeMg3Al2(SiO4)3
Mg SpinelMgAl2O4
AlAluminium
Al CorundumAl2O3
Al NatroliteNa2Al2Si3O10 · 2H2O
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al PyropeMg3Al2(SiO4)3
Al SpinelMgAl2O4
Al Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
SiSilicon
Si BultfonteiniteCa2(HSiO4)F · H2O
Si DiopsideCaMgSi2O6
Si EnstatiteMgSiO3
Si Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Si Garnet GroupX3Z2(SiO4)3
Si NatroliteNa2Al2Si3O10 · 2H2O
Si PectoliteNaCa2Si3O8(OH)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si PyropeMg3Al2(SiO4)3
Si QuartzSiO2
Si Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Si TitaniteCaTi(SiO4)O
Si UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
SSulfur
S BaryteBaSO4
S Baryte (var: Cerian Barite)BaSO4
S PyriteFeS2
KPotassium
K Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
K Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca BultfonteiniteCa2(HSiO4)F · H2O
Ca DiopsideCaMgSi2O6
Ca Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Ca Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Ca Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Ca PectoliteNaCa2Si3O8(OH)
Ca PerovskiteCaTiO3
Ca Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Ca TitaniteCaTi(SiO4)O
Ca UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
TiTitanium
Ti Armalcolite(Mg,Fe2+)Ti2O5
Ti GeikieliteMgTiO3
Ti IlmeniteFe2+TiO3
Ti Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Ti Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Ti PerovskiteCaTiO3
Ti RutileTiO2
Ti TitaniteCaTi(SiO4)O
CrChromium
Cr ChromiteFe2+Cr23+O4
Cr Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Cr Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
FeIron
Fe Armalcolite(Mg,Fe2+)Ti2O5
Fe ChromiteFe2+Cr23+O4
Fe IlmeniteFe2+TiO3
Fe Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Fe Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Fe PyriteFeS2
SrStrontium
Sr Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
ZrZirconium
Zr Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
Zr Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
Zr UM1984-36-SiO:CaNaZr~(Zr,Na,Ca)3Si6O17
BaBarium
Ba BaryteBaSO4
Ba Baryte (var: Cerian Barite)BaSO4
Ba Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Jurassic
145 - 201.3 Ma



ID: 3310465

Age: Jurassic (145 - 201.3 Ma)

Lithology: Volcanic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Permian
251.902 - 298.9 Ma



ID: 3189153
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 298.9 Ma)

Stratigraphic Name: Karoo Supergroup

Comments: Karoo Basin

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Permian
251.902 - 298.9 Ma



ID: 2234951
Volksrust Formation of Ecca Group of Karoo Supergroup

Age: Phanerozoic (251.902 - 298.9 Ma)

Stratigraphic Name: Volksrust Formation

Description: Mudrock

Reference: Council for Geoscience. Geologic map of South Africa, 1:1M. National Science Councils of South Africa. [41]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Dana 7:I:150.
Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Some Aspects of the Mineralogy and Petrology of Ultramafic Xenoliths in Kimberlite. Contributions to Mineralogy and Petrology 26, 75-123.
Rocks & Minerals: 21:130.
Field, M., Stiefenhofer, J., Robey, J., and Kurszlaukis, S. (2008): Kimberlite-hosted diamond deposits of southern Africa: A review. Ore Geology Reviews 34, 33-75.

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