The dome is 38 km in diameter and comprises a series of circular ridges of outward dipping limestones, cherts, sandstones, quartzites and shales ranging in age from upper Precambrian towards the centre to lower Paleozoic sandstones which cap the surrounding plateau.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

13 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

Detailed Mineral List:

ⓘ Albite

Formula: Na(AlSi₃O₈)

References:

Blanc, P. & Pomerol, C. 1973. Presence de filons de roches carbonatees a analcime dans la depression de Tin Jouker, Richat, Adrar de Mauritainie. Comptes Rendus de l'Academie des Sciences, Paris, 265D, 2409-2411.

Trompette, R. 1973. Pétrographie des Richât. A - Les delérites de l'Adrar de Mauritanie et le probléme des analcimolites des Richât (Sahara occidentale). Sciences de la Terre. Mémoires, Nancy, 28, 83-95.

Dietz, R. S., Fudali, R., & Cassidy, W. (1969). Richât and Semsiyat domes (Mauritania): not astroblemes. Geological Society of America Bulletin, 80(7), 1367-1372. doi.org/10.1130/0016-7606(1969)80[1367:RASDMN]2.0.CO

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

NETTO, A.M, FABRE, J., POUPEAU, G. & CHAMPENOIS, M. (1992). Datation par traces de fission (TF) de la structure circulaire des Richat (Mauritanie centrale). Comptes Rendus de l'Academie des Sciences, Paris, 314 (Serie II), 1179-1186.

ⓘ Albite var. Oligoclase

Formula: (Na,Ca)[Al(Si,Al)Si₂O₈]

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ Anatase

Formula: TiO₂

References:

Matton, J. & Jebrak, M. (2014) The ‘‘eye of Africa’’ (Richat dome, Mauritania): An isolated Cretaceous alkaline–hydrothermal complex. Journal of African Earth Sciences 97, 109-124.

ⓘ Ankerite

Formula: Ca(Fe²⁺,Mg)(CO₃)₂

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ Baryte

Formula: BaSO₄

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ Calcite

Formula: CaCO₃

References:

Matton, J. & Jebrak, M. (2014) The ‘‘eye of Africa’’ (Richat dome, Mauritania): An isolated Cretaceous alkaline–hydrothermal complex. Journal of African Earth Sciences 97, 109-124.

ⓘ Dawsonite

Formula: NaAlCO₃(OH)₂

References:

Matton, J. & Jebrak, M. (2014) The ‘‘eye of Africa’’ (Richat dome, Mauritania): An isolated Cretaceous alkaline–hydrothermal complex. Journal of African Earth Sciences 97, 109-124.

ⓘ Gibbsite

Formula: Al(OH)₃

References:

Matton, J. & Jebrak, M. (2014) The ‘‘eye of Africa’’ (Richat dome, Mauritania): An isolated Cretaceous alkaline–hydrothermal complex. Journal of African Earth Sciences 97, 109-124.

ⓘ Hematite

Formula: Fe₂O₃

References:

Matton, J. & Jebrak, M. (2014) The ‘‘eye of Africa’’ (Richat dome, Mauritania): An isolated Cretaceous alkaline–hydrothermal complex. Journal of African Earth Sciences 97, 109-124.

ⓘ Kaolinite

Formula: Al₂(Si₂O₅)(OH)₄

References:

Matton, J. & Jebrak, M. (2014) The ‘‘eye of Africa’’ (Richat dome, Mauritania): An isolated Cretaceous alkaline–hydrothermal complex. Journal of African Earth Sciences 97, 109-124.

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ Nordstrandite

Formula: Al(OH)₃

References:

Matton, J. & Jebrak, M. (2014) The ‘‘eye of Africa’’ (Richat dome, Mauritania): An isolated Cretaceous alkaline–hydrothermal complex. Journal of African Earth Sciences 97, 109-124.

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ Quartz

Formula: SiO₂

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

ⓘ 'Rhombohedral Carbonate'

Formula: (Ca/Mg/Fe/Mn etc)CO₃

References:

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Anatase	4.DD.05	TiO₂
ⓘ	Gibbsite	4.FE.10	Al(OH)₃
ⓘ	Nordstrandite	4.FE.10	Al(OH)₃
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Ankerite	5.AB.10	Ca(Fe²⁺,Mg)(CO₃)₂
ⓘ	Dawsonite	5.BB.10	NaAlCO₃(OH)₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
Group 9 - Silicates
ⓘ	Kaolinite	9.ED.05	Al₂(Si₂O₅)(OH)₄
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
ⓘ	var. Oligoclase	9.FA.35	(Na,Ca)[Al(Si,Al)Si₂O₈]
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
Unclassified
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Rhombohedral Carbonate'	-	(Ca/Mg/Fe/Mn etc)CO₃

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Dawsonite	NaAlCO₃(OH)₂
H	ⓘ Gibbsite	Al(OH)₃
H	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
H	ⓘ Nordstrandite	Al(OH)₃
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
C	Carbon
C	ⓘ Ankerite	Ca(Fe²⁺,Mg)(CO₃)₂
C	ⓘ Calcite	CaCO₃
C	ⓘ Dawsonite	NaAlCO₃(OH)₂
C	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
O	Oxygen
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Anatase	TiO₂
O	ⓘ Ankerite	Ca(Fe²⁺,Mg)(CO₃)₂
O	ⓘ Baryte	BaSO₄
O	ⓘ Calcite	CaCO₃
O	ⓘ Dawsonite	NaAlCO₃(OH)₂
O	ⓘ Gibbsite	Al(OH)₃
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Nordstrandite	Al(OH)₃
O	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Quartz	SiO₂
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
O	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
F	Fluorine
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Dawsonite	NaAlCO₃(OH)₂
Na	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Mg	Magnesium
Mg	ⓘ Ankerite	Ca(Fe²⁺,Mg)(CO₃)₂
Mg	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Dawsonite	NaAlCO₃(OH)₂
Al	ⓘ Gibbsite	Al(OH)₃
Al	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Al	ⓘ Nordstrandite	Al(OH)₃
Al	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Si	Silicon
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Si	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Si	ⓘ Quartz	SiO₂
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Baryte	BaSO₄
Cl	Chlorine
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	Calcium
Ca	ⓘ Ankerite	Ca(Fe²⁺,Mg)(CO₃)₂
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Albite var. Oligoclase	(Na,Ca)[Al(Si,Al)Si₂O₈]
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Ti	Titanium
Ti	ⓘ Anatase	TiO₂
Mn	Manganese
Mn	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Fe	Iron
Fe	ⓘ Ankerite	Ca(Fe²⁺,Mg)(CO₃)₂
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Nb	Niobium
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
Ba	Barium
Ba	ⓘ Baryte	BaSO₄

Geochronology

Mineralization age: Late/Upper Cretaceous : 85 ± 5 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

Phanerozoic

Mesozoic

Cretaceous

Late/Upper Cretaceous

ⓘ Apatite

85 ± 5 Ma

Other Regions, Features and Areas containing this locality

African PlateTectonic Plate

Taoudenni basinBasin
West African CratonCraton

North Africa

Sahara DesertDesert

West AfricaUN Subregion

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

Woolley, A. R., Rankin, A. H., Elliott, C. J., Bishot, A. C., & Niblett, D. (1984). Carbonatite dykes from the Richat dome. Mauritania, and the genesis of the dome: Indian Mineralogist, 189-207.

Woolley, A. R. (2001). Alkaline rocks and carbonatites of the world. Part 3: Africa. Geological Society. Natural History Museum, London, p. 185.

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Mineral List

Rock Types Recorded

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Geochronology

Other Regions, Features and Areas containing this locality

References

Richat Dome, Chinguetti, Adrar Region, Mauritania i
Regional Level Types
Richat Dome Dome
Chinguetti Department
Adrar Region Region
Mauritania Country