Carbonatite intrusion in SW portion of country.

A 3 km diameter "Inselberg" known as Dicker Wilhelm (also spelt Willem), also known as Garubberg. A mountain rising 600 m in the Namib Desert west of Aus.

Approx circular carbonatite intrusion is emplaced in gneisses of the Namaqualand Metamorphic Complex. There are 2 carbonatite centres both of which have steeply dipping concentric structures defined by flow banding, as well as cone sheets and dikes in the basement gneisses.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

19 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Alvikite

ⓘ Calcite-carbonatite

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

References:

Jour Pet 39:2123-2136.

Jackson, M.P.A. 1976. High-grade metamorphism and migmatization of the Namaqua metamorphic complex around Aus in the southern Namib Desert, South West Africa. Bulletin, University of Cape Town, Department of Geology, Chamber of Mines Precambrian Research Unit, 18.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

Woldegabriel, Giday, Aronson, James L., Walter, Robert C. (1990) Geology, geochronology, and rift basin development in the central sector of the Main Ethiopia Rift. Geological Society of America Bulletin, 102 (4) 439-458 doi:10.1130/0016-7606(1990)102<0439:ggarbd>2.3.co;2

Cooper, A. F., Reid, D. L. (1991) Textural evidence for calcite carbonatite magmas, Dicker Willem, southwest Namibia. Geology, 19 (12). 1193-1196 doi:10.1130/0091-7613(1991)019<1193:tefccm>2.3.co;2

Reid, David L., Cooper, Alan F. (1992) Oxygen and carbon isotope patterns in the Dicker Willem carbonatite complex, southern Namibia. Chemical Geology: Isotope Geoscience section, 94 (4). 293-305 doi:10.1016/0168-9622(92)90004-t

Cooper, A. F., Reid, D. L. (1998) Nepheline Sovites as Parental Magmas in Carbonatite Complexes: Evidence from Dicker Willem, Southwest Namibia. Journal of Petrology, 39 (11) 2123-2136 doi:10.1093/petroj/39.11-12.2123

ⓘ Aegirine-augite

Formula: (Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Alkali pyroxene'

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Amphibole Supergroup'

Formula: AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Andradite

Formula: Ca₃Fe³⁺₂(SiO₄)₃

References:

Jour Pet 39:2123-2136.

ⓘ Andradite var. Melanite

Formula: Ca₃Fe³⁺₂(SiO₄)₃

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

References:

Jour Pet 39:2123-2136.

ⓘ Baryte

Formula: BaSO₄

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Biotite'

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

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Calcite

Formula: CaCO₃

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Cancrinite

Formula: (Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O

References:

Jour Pet 39:2123-2136.

ⓘ Dolomite

Formula: CaMg(CO₃)₂

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Feldspar Group'

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Fluorite

Formula: CaF₂

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Goethite

Formula: Fe³⁺O(OH)

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'K Feldspar'

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Mica Group'

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Microlite Group'

Formula: A_2-mTa₂X_6-wZ_-n

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Nepheline

Formula: Na₃K(Al₄Si₄O₁₆)

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

Reid, D. L., & Cooper, A. F. (1998, April). Carbonatite and silicate magmas at Dicker Willem, southern Namibia: their origin and source region characteristics. In International Kimberlite Conference: Extended Abstracts (Vol. 7, No. 1, pp. 727-729).

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Quartz

Formula: SiO₂

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Sanidine

Formula: K(AlSi₃O₈)

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ 'Sodic amphibole'

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Tainiolite

Formula: KLiMg₂(Si₄O₁₀)F₂

References:

Jour Pet 39:2123-2136.

ⓘ Tetraferriphlogopite

Formula: KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂

References:

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Titanite

Formula: CaTi(SiO₄)O

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Wollastonite

Formula: Ca₃(Si₃O₉)

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Jour Pet 39:2123-2136.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	Goethite	4.00.	Fe³⁺O(OH)
ⓘ	'Microlite Group'	4.00.	A_2-mTa₂X_6-wZ_-n
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Dolomite	5.AB.10	CaMg(CO₃)₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
Group 9 - Silicates
ⓘ	Andradite	9.AD.25	Ca₃Fe³⁺₂(SiO₄)₃
ⓘ	var. Melanite	9.AD.25	Ca₃Fe³⁺₂(SiO₄)₃
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Aegirine-augite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Wollastonite	9.DG.05	Ca₃(Si₃O₉)
ⓘ	Tainiolite	9.EC.15	KLiMg₂(Si₄O₁₀)F₂
ⓘ	Tetraferriphlogopite	9.EC.20	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
ⓘ	Nepheline	9.FA.05	Na₃K(Al₄Si₄O₁₆)
ⓘ	Sanidine	9.FA.30	K(AlSi₃O₈)
ⓘ	Cancrinite	9.FB.05	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Unclassified
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Feldspar Group'	-
ⓘ	'Mica Group'	-
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'K Feldspar'	-
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Sodic amphibole'	-
ⓘ	'Alkali pyroxene'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
H	ⓘ Goethite	Fe³⁺O(OH)
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
H	ⓘ Tetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Li	Lithium
Li	ⓘ Tainiolite	KLiMg₂(Si₄O₁₀)F₂
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
C	ⓘ Dolomite	CaMg(CO₃)₂
O	Oxygen
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Baryte	BaSO₄
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
O	ⓘ Dolomite	CaMg(CO₃)₂
O	ⓘ Goethite	Fe³⁺O(OH)
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Quartz	SiO₂
O	ⓘ Sanidine	K(AlSi₃O₈)
O	ⓘ Tetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Wollastonite	Ca₃(Si₃O₉)
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Tainiolite	KLiMg₂(Si₄O₁₀)F₂
O	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
F	Fluorine
F	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Fluorite	CaF₂
F	ⓘ Tetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
F	ⓘ Tainiolite	KLiMg₂(Si₄O₁₀)F₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Na	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Na	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Dolomite	CaMg(CO₃)₂
Mg	ⓘ Tetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
Mg	ⓘ Tainiolite	KLiMg₂(Si₄O₁₀)F₂
Al	Aluminium
Al	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Al	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Al	ⓘ Sanidine	K(AlSi₃O₈)
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Si	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Si	ⓘ Quartz	SiO₂
Si	ⓘ Sanidine	K(AlSi₃O₈)
Si	ⓘ Tetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Wollastonite	Ca₃(Si₃O₉)
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Tainiolite	KLiMg₂(Si₄O₁₀)F₂
Si	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Baryte	BaSO₄
S	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Cl	Chlorine
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
K	ⓘ Sanidine	K(AlSi₃O₈)
K	ⓘ Tetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
K	ⓘ Tainiolite	KLiMg₂(Si₄O₁₀)F₂
Ca	Calcium
Ca	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Ca	ⓘ Dolomite	CaMg(CO₃)₂
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Wollastonite	Ca₃(Si₃O₉)
Ca	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ti	Titanium
Ti	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Titanite	CaTi(SiO₄)O
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Goethite	Fe³⁺O(OH)
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Tetraferriphlogopite	KMg₃(Fe³⁺Si₃O₁₀)(OH,F)₂
Fe	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
Ba	Barium
Ba	ⓘ Baryte	BaSO₄
Ta	Tantalum
Ta	ⓘ Microlite Group	A_2-mTa₂X_6-wZ_-n

Geochronology

Mineralization age: Eocene : 49.8 ± 0.8 Ma to 48 ± 2 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic Time

Rocks, Minerals and Events

ⓘ Biotite (youngest age)	48 ± 2 Ma
ⓘ Biotite (oldest age)	49.8 ± 0.8 Ma

Other Regions, Features and Areas containing this locality

AfricaContinent

African PlateTectonic Plate

Namaqua-Natal BeltOrogenic Belt
Southwest African Coastal basinBasin

Namibia

Namib-Naukluft National ParkNational Park

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.

References

Communications of the Geological Survey South West Africa/Namibia, 4, 3-13.

Cooper, A. F. (1988). Geology of Dicker Willem, a subvolcanic carbonatite complex in South-West Africa.

Reid, D. L., Cooper, A. F., Rex, D. C., Harmer, R. E. (1990) Timing of post–Karoo alkaline volcanism in southern Namibia. Geological Magazine, 127 (5) 427-433 doi:10.1017/s001675680001517x

Cooper, A. F., Reid, D. L. (2000) The association of potassic trachytes and carbonatites at the Dicker Willem Complex, southwest Namibia: coexisting, immiscible, but not cogenetic magmas. Contributions to Mineralogy and Petrology, 139 (5) 570-583 doi:10.1007/s004100000157

Woolley, A. R. (2001) Alkaline Rocks and Carbonatites of the World, Part 3: Africa - Alkaline Rocks and Carbonatites of the World. The Geological Society of London.p.215

von Bezing, Ludi (2007) Namibia - Minerals and Localities (1st ed.). Bode Verlag GmbH.

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