Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Bridgmanite

Formula: (Mg,Fe)SiO₃

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Calcite

Formula: CaCO₃

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Chromite

Formula: Fe²⁺Cr³⁺₂O₄

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ 'Clinopyroxene Subgroup'

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Coesite

Formula: SiO₂

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Corundum

Formula: Al₂O₃

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Diamond

Formula: C

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Mining Ann. Review (1985): 147.

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Diopside

Formula: CaMgSi₂O₆

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Mathias, M., Siebert, J. C., Rickwood, P. C. (1970) Some aspects of the mineralogy and petrology of ultramafic xenoliths in kimberlite. Contributions to Mineralogy and Petrology, 26 (2) 75-123 doi:10.1007/bf00371259

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Diopside var. Chromium-bearing Diopside

Formula: Ca(Mg,Cr)Si₂O₆

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

ⓘ Enstatite

Formula: Mg₂Si₂O₆

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ 'Fayalite-Forsterite Series'

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Field, Matthew; Stiefenhofer, Johann; Robey, Jock; Kurszlaukis, Stephan (2008) Kimberlite-hosted diamond deposits of southern Africa: A review. Ore Geology Reviews, 34 (1). doi:10.1016/j.oregeorev.2007.11.002

ⓘ 'Garnet Group'

Formula: X₃Z₂(SiO₄)₃

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ 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.

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Moissanite

Formula: SiC

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ 'Olivine Group'

Formula: M₂SiO₄

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Omphacite

Formula: (Na_aCa_bFe²⁺_cMg_d)(Al_eFe³⁺_fFe²⁺_gMg_h)Si₂O₆

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ 'Orthopyroxene Subgroup'

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Periclase

Formula: MgO

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

ⓘ Periclase var. Ferropericlase

Formula: (Mg,Fe)O

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Perovskite

Formula: CaTiO₃

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

ⓘ Quartz

Formula: SiO₂

Locality: Koffiefontein Mine, Koffiefontein, Letsemeng Local Municipality, Xhariep District Municipality, Free State, South Africa

References:

Meyer, N. A. (2021). Diamonds and Their Inclusions From the Koffiefontein Mine. Doctor of Philosophy, Department of Earth and Atmospheric Sciences, University of Alberta

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Diamond	1.CB.10a	C
ⓘ	Moissanite	1.DA.	SiC
Group 4 - Oxides and Hydroxides
ⓘ	Periclase	4.AB.25	MgO
ⓘ	var. Ferropericlase	4.AB.25	(Mg,Fe)O
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Corundum	4.CB.05	Al₂O₃
ⓘ	Goldschmidtite (TL)	4.CC.17	KNbO₃
ⓘ	Perovskite	4.CC.30	CaTiO₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Coesite	4.DA.35	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Enstatite	9.DA.05	Mg₂Si₂O₆
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Diopside var. Chromium-bearing Diopside	9.DA.15	Ca(Mg,Cr)Si₂O₆
ⓘ		9.DA.15	CaMgSi₂O₆
ⓘ	Omphacite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Al_eFe³⁺_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Bridgmanite	9.H0.	(Mg,Fe)SiO₃
Unclassified
ⓘ	'Clinopyroxene Subgroup'	-
ⓘ	'Fayalite-Forsterite Series'	-
ⓘ	'Garnet Group'	-	X₃Z₂(SiO₄)₃
ⓘ	'Orthopyroxene Subgroup'	-
ⓘ	'Olivine Group'	-	M₂SiO₄

List of minerals for each chemical element

C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Diamond	C
C	ⓘ Moissanite	SiC
O	Oxygen
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Calcite	CaCO₃
O	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Coesite	SiO₂
O	ⓘ Corundum	Al₂O₃
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Enstatite	Mg₂Si₂O₆
O	ⓘ Omphacite	(Na_aCa_bFe_c²⁺Mg_d)(Al_eFe_f³⁺Fe_g²⁺Mg_h)Si₂O₆
O	ⓘ Periclase	MgO
O	ⓘ Perovskite	CaTiO₃
O	ⓘ Quartz	SiO₂
O	ⓘ Fayalite-Forsterite Series
O	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
O	ⓘ Olivine Group	M₂SiO₄
O	ⓘ Periclase var. Ferropericlase	(Mg,Fe)O
O	ⓘ Bridgmanite	(Mg,Fe)SiO₃
O	ⓘ Goldschmidtite	KNbO₃
Na	Sodium
Na	ⓘ Omphacite	(Na_aCa_bFe_c²⁺Mg_d)(Al_eFe_f³⁺Fe_g²⁺Mg_h)Si₂O₆
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Enstatite	Mg₂Si₂O₆
Mg	ⓘ Omphacite	(Na_aCa_bFe_c²⁺Mg_d)(Al_eFe_f³⁺Fe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Periclase	MgO
Mg	ⓘ Fayalite-Forsterite Series
Mg	ⓘ Periclase var. Ferropericlase	(Mg,Fe)O
Mg	ⓘ Bridgmanite	(Mg,Fe)SiO₃
Al	Aluminium
Al	ⓘ Corundum	Al₂O₃
Al	ⓘ Omphacite	(Na_aCa_bFe_c²⁺Mg_d)(Al_eFe_f³⁺Fe_g²⁺Mg_h)Si₂O₆
Si	Silicon
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Si	ⓘ Coesite	SiO₂
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Enstatite	Mg₂Si₂O₆
Si	ⓘ Moissanite	SiC
Si	ⓘ Omphacite	(Na_aCa_bFe_c²⁺Mg_d)(Al_eFe_f³⁺Fe_g²⁺Mg_h)Si₂O₆
Si	ⓘ Quartz	SiO₂
Si	ⓘ Fayalite-Forsterite Series
Si	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
Si	ⓘ Olivine Group	M₂SiO₄
Si	ⓘ Bridgmanite	(Mg,Fe)SiO₃
K	Potassium
K	ⓘ Goldschmidtite	KNbO₃
Ca	Calcium
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Omphacite	(Na_aCa_bFe_c²⁺Mg_d)(Al_eFe_f³⁺Fe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Perovskite	CaTiO₃
Ti	Titanium
Ti	ⓘ Perovskite	CaTiO₃
Cr	Chromium
Cr	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Omphacite	(Na_aCa_bFe_c²⁺Mg_d)(Al_eFe_f³⁺Fe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Fayalite-Forsterite Series
Fe	ⓘ Periclase var. Ferropericlase	(Mg,Fe)O
Fe	ⓘ Bridgmanite	(Mg,Fe)SiO₃
Nb	Niobium
Nb	ⓘ Goldschmidtite	KNbO₃

Fossils

There are 1 fossil locality from the PaleoBioDB database within this region.

These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.

Occurrences

Youngest Fossil Listed

Oldest Fossil Listed

0.01 Ma (Pleistocene)

Fossils from Region

Click here to show the list.

Accepted Name	Hierarchy	Age
Bos taurus species	Animalia : Chordata : Mammalia : Artiodactyla : Bovidae : Bos : *Bos taurus*	0.0117 - 0 Ma Quaternary
Phacochoerus aethiopicus species	Animalia : Chordata : Mammalia : Artiodactyla : Suidae : Phacochoerus : *Phacochoerus aethiopicus*	0.0117 - 0 Ma Quaternary
Raphicerus campestris species	Animalia : Chordata : Mammalia : Artiodactyla : Bovidae : Raphicerus : *Raphicerus campestris*	0.0117 - 0 Ma Quaternary
Syncerus caffer species	Animalia : Chordata : Mammalia : Artiodactyla : Bovidae : Syncerus : *Syncerus caffer*	0.0117 - 0 Ma Quaternary

Fossil Localities

Click to show 1 fossil locality

South Africa

Free State
- Xhariep District Municipality
  - Quaternary🐚 Lemoenfontein

Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Letsemeng_Local_Municipality
Wikidata ID:	Q1821165
GeoNames ID:	8347471

Localities in this Region

South Africa

Free State
- Xhariep District Municipality
  - Letsemeng Local Municipality
    - ⭔Koffiefontein
      - Koffiefontein Mine

Other Regions, Features and Areas that Intersect

AfricaContinent

African PlateTectonic Plate

Karoo basinBasin

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

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