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Elgeyo Escarpment and Kamasia Hills Volcanic area, Kenyai
Regional Level Types
Elgeyo Escarpment and Kamasia Hills Volcanic areaVolcanic Field
KenyaCountry

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Type:
Volcanic Field
Age:
15.3 to 1.9 Ma
Geologic Time:
Cenozoic
Reference for age:
Truckle, P.H. 1978. Geological map of the Eldama Ravine - Kabarnet area (Scale 1:125000). Directorate of Overseas Surveys, Ordnance Survey, East African Geological Research Unit, Kenya Rift Valley Project.
Mindat Locality ID:
406890
Long-form identifier:
mindat:1:2:406890:0
GUID (UUID V4):
0


The area extends westwards from the floor of the Gregory Rift, includes the Kamasia Hills and the western wall of the rift, marked the impressive Elgeyo Escarpment which rises over 1500 m above the valley floor, to the western rift shoulder.
Approx coords range: 0º00' - 1º00'N; 35º30' - 36º00'E.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

15 valid minerals.

Rock Types Recorded

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

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine
Formula: NaFe3+Si2O6
ⓘ Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘ Aenigmatite
Formula: Na4[Fe2+10Ti2]O4[Si12O36]
ⓘ 'Alkali Feldspar'
ⓘ 'Amphibole Supergroup'
Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ Analcime
Formula: Na(AlSi2O6) · H2O
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Calcite
Formula: CaCO3
ⓘ Fluorapatite
Formula: Ca5(PO4)3F
ⓘ Fluorite
Formula: CaF2
ⓘ Kanemite
Formula: HNaSi2O5 · 3H2O
ⓘ Magadiite
Formula: Na2Si14O29 · 11H2O
ⓘ Nahcolite
Formula: NaHCO3
ⓘ Nepheline
Formula: Na3K(Al4Si4O16)
ⓘ Opal
Formula: SiO2 · nH2O
ⓘ Opal var. Opaline
Formula: SiO2 · nH2O
ⓘ Riebeckite
Formula: ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘ Thermonatrite
Formula: Na2CO3 · H2O
ⓘ Trona
Formula: Na3H(CO3)2 · 2H2O

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘOpal4.DA.10SiO2 · nH2O
ⓘvar. Opaline4.DA.10SiO2 · nH2O
Group 5 - Nitrates and Carbonates
ⓘNahcolite5.AA.15NaHCO3
ⓘCalcite5.AB.05CaCO3
ⓘThermonatrite5.CB.05Na2CO3 · H2O
ⓘTrona5.CB.15Na3H(CO3)2 · 2H2O
Group 8 - Phosphates, Arsenates and Vanadates
ⓘFluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
ⓘAegirine-augite9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘAegirine9.DA.25NaFe3+Si2O6
ⓘRiebeckite9.DE.25◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
ⓘAenigmatite9.DH.40Na4[Fe2+10Ti2]O4[Si12O36]
ⓘMagadiite9.EA.20Na2Si14O29 · 11H2O
ⓘKanemite9.EF.25HNaSi2O5 · 3H2O
ⓘNepheline9.FA.05Na3K(Al4Si4O16)
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
Unclassified
ⓘ'Alkali Feldspar'-
ⓘ'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

List of minerals for each chemical element

HHydrogen
Hⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hⓘ AnalcimeNa(AlSi2O6) · H2O
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ KanemiteHNaSi2O5 · 3H2O
Hⓘ MagadiiteNa2Si14O29 · 11H2O
Hⓘ NahcoliteNaHCO3
Hⓘ OpalSiO2 · nH2O
Hⓘ Opal var. OpalineSiO2 · nH2O
Hⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Hⓘ ThermonatriteNa2CO3 · H2O
Hⓘ TronaNa3H(CO3)2 · 2H2O
CCarbon
Cⓘ CalciteCaCO3
Cⓘ NahcoliteNaHCO3
Cⓘ ThermonatriteNa2CO3 · H2O
Cⓘ TronaNa3H(CO3)2 · 2H2O
OOxygen
Oⓘ AegirineNaFe3+Si2O6
Oⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Oⓘ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Oⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oⓘ AnalcimeNa(AlSi2O6) · H2O
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CalciteCaCO3
Oⓘ FluorapatiteCa5(PO4)3F
Oⓘ KanemiteHNaSi2O5 · 3H2O
Oⓘ MagadiiteNa2Si14O29 · 11H2O
Oⓘ NahcoliteNaHCO3
Oⓘ NephelineNa3K(Al4Si4O16)
Oⓘ OpalSiO2 · nH2O
Oⓘ Opal var. OpalineSiO2 · nH2O
Oⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Oⓘ ThermonatriteNa2CO3 · H2O
Oⓘ TronaNa3H(CO3)2 · 2H2O
FFluorine
Fⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluorapatiteCa5(PO4)3F
Fⓘ FluoriteCaF2
NaSodium
Naⓘ AegirineNaFe3+Si2O6
Naⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Naⓘ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Naⓘ AnalcimeNa(AlSi2O6) · H2O
Naⓘ KanemiteHNaSi2O5 · 3H2O
Naⓘ MagadiiteNa2Si14O29 · 11H2O
Naⓘ NahcoliteNaHCO3
Naⓘ NephelineNa3K(Al4Si4O16)
Naⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Naⓘ ThermonatriteNa2CO3 · H2O
Naⓘ TronaNa3H(CO3)2 · 2H2O
MgMagnesium
Mgⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Alⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Alⓘ AnalcimeNa(AlSi2O6) · H2O
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ NephelineNa3K(Al4Si4O16)
SiSilicon
Siⓘ AegirineNaFe3+Si2O6
Siⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Siⓘ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Siⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Siⓘ AnalcimeNa(AlSi2O6) · H2O
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ KanemiteHNaSi2O5 · 3H2O
Siⓘ MagadiiteNa2Si14O29 · 11H2O
Siⓘ NephelineNa3K(Al4Si4O16)
Siⓘ OpalSiO2 · nH2O
Siⓘ Opal var. OpalineSiO2 · nH2O
Siⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
PPhosphorus
Pⓘ FluorapatiteCa5(PO4)3F
ClChlorine
Clⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ NephelineNa3K(Al4Si4O16)
CaCalcium
Caⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Caⓘ CalciteCaCO3
Caⓘ FluorapatiteCa5(PO4)3F
Caⓘ FluoriteCaF2
TiTitanium
Tiⓘ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Tiⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ AegirineNaFe3+Si2O6
Feⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Feⓘ AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2

Localities in this Region

Kenya

Other Regions, Features and Areas that Intersect

AfricaContinent
African Plate
Somali PlateTectonic Plate

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

Truckle, P.H. 1978. Geological map of the Eldama Ravine - Kabarnet area (Scale 1:125000). Directorate of Overseas Surveys, Ordnance Survey, East African Geological Research Unit, Kenya Rift Valley Project.
Walsh, J. (1969). Geology of the Eldama Ravine-Kabarnet area. Rep. Geol. Surv. Kenya, 83, 1-48.
Chapman, G. R., Lippard, S. J., & Martyn, J. E. (1978). The stratigraphy and structure of the Kamasia Range, Kenya rift valley. Journal of the Geological Society, 135(3), 265-281. doi.org/10.1144/gsjgs.135.3.0265
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.113
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