Located 20km north-east of Okahandja, located on Otjisazu Farm 53. Alkaline complex, covers about 12 km² and is emplaced in schists of the Damara sequence.
Apatite is concentrated patchily in the alkaline pyroxenite, some segregations of pure apatite rock being 50 cm in diameter, while it is also concentrated in the sövites. Geochemical sampling of soils defined areas of 2 - 2.9% and over 3% P₂O₅ and 100-199 and over 200 ppm copper; the two areas have a high degree of coincidence (Gunthorpe & Buerger 1986).

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

12 valid minerals.

Rock Types Recorded

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

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Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

Reference: Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa. 35.

ⓘ Aegirine-augite

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

Reference: Gunthorpe, R. J., & Buerger, A. D. (1986). Geology and economic evaluation of the Otjisazu alkaline igneous complex, central South West Africa/Namibia. In Mineral Deposits of Southern Africa (pp. 2255-2260).

ⓘ 'Amphibole Supergroup'

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

ⓘ Andradite

Formula: Ca₃Fe³⁺₂(SiO₄)₃

ⓘ Andradite var. Melanite

Formula: Ca₃(Fe³⁺,Ti)₂(SiO₄)₃

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

Reference: Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa. 35.

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂

ⓘ Calcite

Formula: CaCO₃

ⓘ Copper

Formula: Cu

ⓘ Diopside

Formula: CaMgSi₂O₆

ⓘ Fluorapatite

Formula: Ca₅(PO₄)₃F

Description: Occurs as 3 different habits, finely disseminated grains, pale green massive nodules up to 50cm diameter and as crystals up to 5cm long in mafic pegmatites in association with aegirine, augite and titanite.

Reference: Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa. 35.

ⓘ 'Garnet Group'

Formula: X₃Z₂(SiO₄)₃

ⓘ 'Hornblende'

ⓘ 'K Feldspar'

Formula: KAlSi₃O₈

ⓘ Microcline

Formula: K(AlSi₃O₈)

ⓘ 'Microperthite'

ⓘ Nepheline

Formula: Na₃K(Al₄Si₄O₁₆)

ⓘ 'Scapolite'

ⓘ 'Sodic plagioclase'

ⓘ Titanite

Formula: CaTi(SiO₄)O

Reference: Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa. 35. Gunthorpe, R. J., & Buerger, A. D. (1986). Geology and economic evaluation of the Otjisazu alkaline igneous complex, central South West Africa/Namibia. In Mineral Deposits of Southern Africa (pp. 2255-2260).

ⓘ Wollastonite

Formula: Ca₃(Si₃O₉)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Copper	1.AA.05	Cu
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Fluorapatite	8.BN.05	Ca₅(PO₄)₃F
Group 9 - Silicates
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Aegirine-augite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Andradite	9.AD.25	Ca₃Fe³⁺₂(SiO₄)₃
ⓘ	var. Melanite	9.AD.25	Ca₃(Fe³⁺,Ti)₂(SiO₄)₃
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Diopside	9.DA.15	CaMgSi₂O₆
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
ⓘ	Nepheline	9.FA.05	Na₃K(Al₄Si₄O₁₆)
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Wollastonite	9.DG.05	Ca₃(Si₃O₉)
Unclassified Minerals, Rocks, etc.
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
ⓘ	'Garnet Group'	-	X₃Z₂(SiO₄)₃
ⓘ	'Hornblende'	-
ⓘ	'K Feldspar'	-	KAlSi₃O₈
ⓘ	'Microperthite'	-
ⓘ	'Scapolite'	-
ⓘ	'Sodic plagioclase'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
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 or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Fluorapatite	Ca₅(PO₄)₃F
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
O	ⓘ K Feldspar	KAlSi₃O₈
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
O	ⓘ Andradite var. Melanite	Ca₃(Fe³⁺,Ti)₂(SiO₄)₃
O	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
O	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Wollastonite	Ca₃(Si₃O₉)
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
O	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
F	Fluorine
F	ⓘ Fluorapatite	Ca₅(PO₄)₃F
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
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 or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Na	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Al	Aluminium
Al	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Al	ⓘ K Feldspar	KAlSi₃O₈
Al	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Si	ⓘ K Feldspar	KAlSi₃O₈
Si	ⓘ Andradite var. Melanite	Ca₃(Fe³⁺,Ti)₂(SiO₄)₃
Si	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
Si	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Wollastonite	Ca₃(Si₃O₉)
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Si	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
P	Phosphorus
P	ⓘ Fluorapatite	Ca₅(PO₄)₃F
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Cl	Chlorine
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
K	Potassium
K	ⓘ K Feldspar	KAlSi₃O₈
K	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Ca	Calcium
Ca	ⓘ Fluorapatite	Ca₅(PO₄)₃F
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	ⓘ Andradite var. Melanite	Ca₃(Fe³⁺,Ti)₂(SiO₄)₃
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Wollastonite	Ca₃(Si₃O₉)
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Ti	Titanium
Ti	ⓘ Titanite	CaTi(SiO₄)O
Ti	ⓘ Andradite var. Melanite	Ca₃(Fe³⁺,Ti)₂(SiO₄)₃
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 or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Andradite var. Melanite	Ca₃(Fe³⁺,Ti)₂(SiO₄)₃
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂ or Simplified: K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Fe	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Cu	Copper
Cu	ⓘ Copper	Cu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)

Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa. 35.

Woolley, A. R. (2001). Alkaline rocks and carbonatites of the world. Part 3: Africa. Geological Society. Natural History Museum, London, p. 212.

Gunthorpe, R. J., & Buerger, A. D. (1986). Geology and economic evaluation of the Otjisazu alkaline igneous complex, central South West Africa/Namibia. In Mineral Deposits of Southern Africa (pp. 2255-2260).

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Rock Types Recorded

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Detailed Mineral List:

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List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

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Otjisazu Complex, Okahandja Constituency, Otjozondjupa Region, Namibia i
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