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Lake Magadi, Kajiado County, Kenyai
Regional Level Types
Lake MagadiLake
Kajiado CountyCounty

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Latitude & Longitude (WGS84): 1° 52' 59'' South , 36° 16' 0'' East
Latitude & Longitude (decimal): -1.88333,36.26667
GeoHash:G#: kz9v330sf
Locality type:Lake
Köppen climate type:Aw : Tropical savanna, wet
Nearest Settlements:
Magadi14,529 (2013)3.0km

Soda lake.
Also extensive deposits of chert.
In June 1959, E.P. Saggerson and B.H. Baker of the Geological Survey of Kenya discovered a number of small alkaline intrusions in upper Tertiary lavas on the Nguruman Escarpment, which forms the western wall of the Rift Valley about seventy miles south west of Nairobi. During a detailed examination of these intrusions in 1960, they found the alkaline rocks to be emplaced in a flow of ankaratrite (biotite-olivine melanephelinite), that is evidently intercalated in more common olivine basalts. The intrusions, which are probably of upper Tertiary age, are closely controlled by two north-south vertical fault zones in the ankaratrite. Narrow dykes feed sills about 2 ft. thick and these thin rapidly into an intricate network of veins.

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate
Rift Valley Province, KenyaProvince

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

7 valid minerals. 3 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and 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:

Formula: NaCl
Kenyaite (TL)
Formula: Na2Si22O41(OH)8 · 6H2O
Type Locality:
Magadiite (TL)
Formula: Na2Si14O29 · 11H2O
Type Locality:
Makatite (TL)
Formula: Na2Si4O8(OH)2 · 4H2O
Type Locality:
Formula: NaHCO3
Formula: Na3H(CO3)2 · 2H2O
Formula: Ca3(Ti,Al,Zr)9O20 ?
'Uvite Series'
Formula: Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Formula: NaF

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Group 5 - Nitrates and Carbonates
Trona5.CB.15Na3H(CO3)2 · 2H2O
Group 9 - Silicates
Kenyaite (TL)9.HA.10Na2Si22O41(OH)8 · 6H2O
Magadiite (TL)9.EA.20Na2Si14O29 · 11H2O
Makatite (TL)9.EE.45Na2Si4O8(OH)2 · 4H2O
'Uvite Series'9..Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Unclassified Minerals, Rocks, etc.
'Uhligite'-Ca3(Ti,Al,Zr)9O20 ?

List of minerals arranged by Dana 8th Edition classification

'Uhligite',Al,Zr)9O20 ?
Trona13.1.4.1Na3H(CO3)2 · 2H2O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
'Uvite Series'
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Makatite (TL) · 4H2O
Group 78 - Unclassified Silicates
Kenyaite (TL) · 6H2O
Magadiite (TL) · 11H2O
Unclassified Minerals, Mixtures, etc.

List of minerals for each chemical element

H KenyaiteNa2Si22O41(OH)8 · 6H2O
H MagadiiteNa2Si14O29 · 11H2O
H MakatiteNa2Si4O8(OH)2 · 4H2O
H NahcoliteNaHCO3
H TronaNa3H(CO3)2 · 2H2O
C NahcoliteNaHCO3
C TronaNa3H(CO3)2 · 2H2O
O KenyaiteNa2Si22O41(OH)8 · 6H2O
O MagadiiteNa2Si14O29 · 11H2O
O MakatiteNa2Si4O8(OH)2 · 4H2O
O NahcoliteNaHCO3
O UhligiteCa3(Ti,Al,Zr)9O20 ?
O TronaNa3H(CO3)2 · 2H2O
F VilliaumiteNaF
Na KenyaiteNa2Si22O41(OH)8 · 6H2O
Na MagadiiteNa2Si14O29 · 11H2O
Na MakatiteNa2Si4O8(OH)2 · 4H2O
Na NahcoliteNaHCO3
Na TronaNa3H(CO3)2 · 2H2O
Na VilliaumiteNaF
Na HaliteNaCl
Al UhligiteCa3(Ti,Al,Zr)9O20 ?
Si KenyaiteNa2Si22O41(OH)8 · 6H2O
Si MagadiiteNa2Si14O29 · 11H2O
Si MakatiteNa2Si4O8(OH)2 · 4H2O
Cl HaliteNaCl
Ca UhligiteCa3(Ti,Al,Zr)9O20 ?
Ti UhligiteCa3(Ti,Al,Zr)9O20 ?
Zr UhligiteCa3(Ti,Al,Zr)9O20 ?

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

0 - 2.588 Ma

ID: 3306518

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Volcanic

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

2.588 - 23.03 Ma

ID: 3186107
Cenozoic volcanic rocks

Age: Neogene (2.588 - 23.03 Ma)

Lithology: Intermediate volcanic rocks; phonolite

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]

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


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Baker, B.H. (1958) Geology of the Magadi area. Geological Survey of Kenya report No. 42.
Hay, R.L. (1964) Phillipsite of Saline Lakes and Soils. The American Mineralogist, 49, 1366-1387.
Saggerson, E.P. and Williams, L.A.J. (1964) Ngurumanite from Southern Kenya and its Bearing on the Origin of Rocks in the Northern Tanganyika Alkaline District. Journal of Petrology, Volume 5:1, 1 January 1964, Pages 40–81.
Eugster, H.P. (1967) Hydrous sodium silicates from Lake Magadi, Kenya; precursors of bedded chert. Science: 157: 1177-1180.
Eugster, H.P. and Jones, B.F. (1968) Gels composed of sodium aluminum silicate, Lake Magadi, Kenya. Science: 161: 160-164.
Eugster, H.P. (1969) Inorganic bedded cherts from the Magadi area, Kenya. Contributions to Mineralogy & Petrology: 22: 1-31.
Nielsen, J.M. (1999) East African magadi (trona): fluoride concentration and mineralogical composition. Journal of African Earth Sciences: 29: 423-428.

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