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

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Key
05724560014946415952709.jpg
Outcrop of chemogenic chert

Lake Magadi, Kajiado County, Kenya
Latitude & Longitude (WGS84):
1° 52' 59'' South , 36° 16' 0'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
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.

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:

'Chabazite'
Reference: Hay, R.L. (1964) Phillipsite of Saline Lakes and Soils. The American Mineralogist, 49, 1366-1387.
'Clinoptilolite'
Reference: Hay, R.L. (1964) Phillipsite of Saline Lakes and Soils. The American Mineralogist, 49, 1366-1387.
'Erionite'
Reference: Hay, R.L. (1964) Phillipsite of Saline Lakes and Soils. The American Mineralogist, 49, 1366-1387.
Halite
Formula: NaCl
Reference: Nielsen, J.M. (1999) East African magadi (trona): fluoride concentration and mineralogical composition. Journal of African Earth Sciences: 29: 423-428.
Kenyaite (TL)
Formula: Na2Si22O41(OH)8 · 6H2O
Type Locality:
Reference: McAtee, J.L., House, R., Eugster, H.P. (1968) Magadiite from Trinity County, California. The American Mineralogist, 53, 2061-2069. HB2/1 (1995).
Magadiite (TL)
Formula: Na2Si14O29 · 11H2O
Type Locality:
Reference: Eugster, H.P. (1967) Hydrous sodium silicates from Lake Magadi, Kenya: Precursors of bedded chert. Science: 157: 1177-1180.; McAtee, J.L., House, R., Eugster, H.P. (1968) Magadiite from Trinity County, California. The American Mineralogist: 53: 2061-2069.; HB2/2 (1995).; New data on minerals. M.: 2003. Volume 38 pp113.
Makatite (TL)
Formula: Na2Si4O8(OH)2 · 4H2O
Type Locality:
Reference: Sheppard, R.A., Gude, A.J. (1970) Makatite, A new hydrous sodium silicate mineral from Lake Magadi, Kenya. The American Mineralogist, 55, 358-366. HB2/2 (1995).
Nahcolite
Formula: NaHCO3
Reference: Geological Society of America Abstracts with Programs, Vol. 42, No. 5, p. 404
'Phillipsite'
Reference: Hay, R.L. (1964) Phillipsite of Saline Lakes and Soils. The American Mineralogist, 49, 1366-1387.
Trona
Formula: Na3H(CO3)2 · 2H2O
Reference: Nielsen, J.M. (1999) East African magadi (trona): fluoride concentration and mineralogical composition. Journal of African Earth Sciences: 29: 423-428.
'Uhligite'
Formula: Ca3(Ti,Al,Zr)9O20 ?
Description: Discredited by IMA in 2006 (IMA 06–C), possible perovskite or zirkelite(?).cf. Burke 2006.
Reference: New data on minerals. M.: 2003. Volume 38 pp113.
'Uvite Series'
Formula: Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Villiaumite
Formula: NaF
Reference: Nielsen, J.M. (1999) East African magadi (trona): fluoride concentration and mineralogical composition. Journal of African Earth Sciences: 29: 423-428.

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Halite3.AA.20NaCl
Villiaumite3.AA.20NaF
Group 5 - Nitrates and Carbonates
Nahcolite5.AA.15NaHCO3
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.
'Chabazite'-
'Clinoptilolite'-
'Erionite'-
'Phillipsite'-
'Uhligite'-Ca3(Ti,Al,Zr)9O20 ?

List of minerals arranged by Dana 8th Edition classification

Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
Miscellaneous
'Uhligite'8.7.2.1Ca3(Ti,Al,Zr)9O20 ?
Group 9 - NORMAL HALIDES
AX
Halite9.1.1.1NaCl
Villiaumite9.1.1.3NaF
Group 13 - ACID CARBONATES
Miscellaneous
Nahcolite13.1.1.1NaHCO3
Trona13.1.4.1Na3H(CO3)2 · 2H2O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
'Uvite Series'61.3.1.3Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Makatite (TL)74.3.5.2Na2Si4O8(OH)2 · 4H2O
Group 78 - Unclassified Silicates
Kenyaite (TL)78.7.7.1Na2Si22O41(OH)8 · 6H2O
Magadiite (TL)78.7.12.1Na2Si14O29 · 11H2O
Unclassified Minerals, Mixtures, etc.
'Chabazite'-
'Clinoptilolite'-
'Erionite'-
'Phillipsite'-

List of minerals for each chemical element

HHydrogen
H KenyaiteNa2Si22O41(OH)8 · 6H2O
H MagadiiteNa2Si14O29 · 11H2O
H MakatiteNa2Si4O8(OH)2 · 4H2O
H NahcoliteNaHCO3
H TronaNa3H(CO3)2 · 2H2O
CCarbon
C NahcoliteNaHCO3
C TronaNa3H(CO3)2 · 2H2O
OOxygen
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
FFluorine
F VilliaumiteNaF
NaSodium
Na KenyaiteNa2Si22O41(OH)8 · 6H2O
Na MagadiiteNa2Si14O29 · 11H2O
Na MakatiteNa2Si4O8(OH)2 · 4H2O
Na NahcoliteNaHCO3
Na TronaNa3H(CO3)2 · 2H2O
Na VilliaumiteNaF
Na HaliteNaCl
AlAluminium
Al UhligiteCa3(Ti,Al,Zr)9O20 ?
SiSilicon
Si KenyaiteNa2Si22O41(OH)8 · 6H2O
Si MagadiiteNa2Si14O29 · 11H2O
Si MakatiteNa2Si4O8(OH)2 · 4H2O
ClChlorine
Cl HaliteNaCl
CaCalcium
Ca UhligiteCa3(Ti,Al,Zr)9O20 ?
TiTitanium
Ti UhligiteCa3(Ti,Al,Zr)9O20 ?
ZrZirconium
Zr UhligiteCa3(Ti,Al,Zr)9O20 ?

References

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.

External Links


Other Regions, Features and Areas containing this locality

Africa
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Somali PlateTectonic Plate

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