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Rangwa carbonatite complex, Kisingiri Volcano, Homa Bay County, Kenyai
Regional Level Types
Rangwa carbonatite complexComplex
Kisingiri VolcanoVolcano
Homa Bay CountyCounty
KenyaCountry

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Latitude & Longitude (WGS84):
0° 34' 0'' South , 34° 8' 59'' East
Latitude & Longitude (decimal):
-0.56667,34.15000
GRN:
S01E24
Type:
Complex
Age:
16 Ma
Geologic Time:
Miocene
Köppen climate type:
Am : Tropical monsoon climate
Mindat Locality ID:
285421
Long-form identifier:
mindat:1:2:285421:5
GUID (UUID V4):
0


5.5 km wide hill

Rangwa is a caldera of Kisingiri Volcano, Homa Bay County, Kenya, it forms a circular group of hills consisting largely of inward-dipping extrusive agglomerates and tuffs into which breccias, ring dikes of carbonatite, plugs and cone sheets were intruded (Le Bas 1977).

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

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

10 valid minerals.

Rock Types Recorded


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
ⓘ Analcime
Formula: Na(AlSi2O6) · H2O
ⓘ 'Apatite'
Formula: Ca5(PO4)3A
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Calcite
Formula: CaCO3
References:
Deines, P, Gold, D.P (1973) The isotopic composition of carbonatite and kimberlite carbonates and their bearing on the isotopic composition of deep-seated carbon. Geochimica et Cosmochimica Acta, 37 (7) 1709-1733 doi:10.1016/0016-7037(73)90158-0
Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Norry, M. J., Truckle, P. H., Lippard, S. J., Hawkesworth, C. J., Weaver, S. D., & Marriner, G. F. (1980). Isotopic and trace element evidence from lavas, bearing on mantle heterogeneity beneath Kenya. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 297(1431), 259-271. doi.org/10.1098/rsta.1980.0214
Rosatelli, G., Wall, F., Le Bas, M. J. (2003) Potassic glass and calcite carbonatite in lapilli from extrusive carbonatites at Rangwa Caldera Complex, Kenya. Mineralogical Magazine, 67 (5) 931-955 doi:10.1180/0026461036750152
ⓘ Diopside
Formula: CaMgSi2O6
ⓘ 'Feldspar Group'
ⓘ Fluorapatite
Formula: Ca5(PO4)3F
ⓘ Fluorapatite var. Carbonate-rich Fluorapatite
Formula: Ca5(PO4,CO3)3(F,O)
ⓘ 'K Feldspar'
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ 'Melilite Group'
Formula: Ca2M(XSiO7)
ⓘ 'Mica Group'
ⓘ Nepheline
Formula: Na3K(Al4Si4O16)
ⓘ Orthoclase
Formula: K(AlSi3O8)
ⓘ Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
References:
Deines, P, Gold, D.P (1973) The isotopic composition of carbonatite and kimberlite carbonates and their bearing on the isotopic composition of deep-seated carbon. Geochimica et Cosmochimica Acta, 37 (7) 1709-1733 doi:10.1016/0016-7037(73)90158-0
Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Norry, M. J., Truckle, P. H., Lippard, S. J., Hawkesworth, C. J., Weaver, S. D., & Marriner, G. F. (1980). Isotopic and trace element evidence from lavas, bearing on mantle heterogeneity beneath Kenya. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 297(1431), 259-271. doi.org/10.1098/rsta.1980.0214
Rosatelli, G., Wall, F., Le Bas, M. J. (2003) Potassic glass and calcite carbonatite in lapilli from extrusive carbonatites at Rangwa Caldera Complex, Kenya. Mineralogical Magazine, 67 (5) 931-955 doi:10.1180/0026461036750152
ⓘ 'Pyrochlore Group'
Formula: A2Nb2(O,OH)6Z
ⓘ 'Rhombohedral Carbonate'
Formula: (Ca/Mg/Fe/Mn etc)CO3
ⓘ Titanite
Formula: CaTi(SiO4)O

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ'Pyrochlore Group'4.00.A2Nb2(O,OH)6Z
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 8 - Phosphates, Arsenates and Vanadates
ⓘFluorapatite
var. Carbonate-rich Fluorapatite		8.BN.05Ca5(PO4,CO3)3(F,O)
ⓘ8.BN.05Ca5(PO4)3F
Group 9 - Silicates
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘDiopside9.DA.15CaMgSi2O6
ⓘAegirine9.DA.25NaFe3+Si2O6
ⓘPhlogopite9.EC.20KMg3(AlSi3O10)(OH)2
ⓘNepheline9.FA.05Na3K(Al4Si4O16)
ⓘOrthoclase9.FA.30K(AlSi3O8)
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Feldspar Group'-
ⓘ'Mica Group'-
ⓘ'K Feldspar'-
ⓘ'Apatite'-Ca5(PO4)3A
ⓘ'Melilite Group'-Ca2M(XSiO7)
ⓘ'Rhombohedral Carbonate'-(Ca/Mg/Fe/Mn etc)CO3

List of minerals for each chemical element

HHydrogen
Hⓘ AnalcimeNa(AlSi2O6) · H2O
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Hⓘ Pyrochlore GroupA2Nb2(O,OH)6Z
CCarbon
Cⓘ CalciteCaCO3
Cⓘ Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
Cⓘ Rhombohedral Carbonate(Ca/Mg/Fe/Mn etc)CO3
OOxygen
Oⓘ AegirineNaFe3+Si2O6
Oⓘ AnalcimeNa(AlSi2O6) · H2O
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CalciteCaCO3
Oⓘ Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
Oⓘ DiopsideCaMgSi2O6
Oⓘ FluorapatiteCa5(PO4)3F
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ NephelineNa3K(Al4Si4O16)
Oⓘ OrthoclaseK(AlSi3O8)
Oⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Oⓘ Pyrochlore GroupA2Nb2(O,OH)6Z
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ ApatiteCa5(PO4)3A
Oⓘ Melilite GroupCa2M(XSiO7)
Oⓘ Rhombohedral Carbonate(Ca/Mg/Fe/Mn etc)CO3
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
Fⓘ FluorapatiteCa5(PO4)3F
NaSodium
Naⓘ AegirineNaFe3+Si2O6
Naⓘ AnalcimeNa(AlSi2O6) · H2O
Naⓘ NephelineNa3K(Al4Si4O16)
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ DiopsideCaMgSi2O6
Mgⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgⓘ Rhombohedral Carbonate(Ca/Mg/Fe/Mn etc)CO3
AlAluminium
Alⓘ AnalcimeNa(AlSi2O6) · H2O
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ NephelineNa3K(Al4Si4O16)
Alⓘ OrthoclaseK(AlSi3O8)
Alⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
SiSilicon
Siⓘ AegirineNaFe3+Si2O6
Siⓘ AnalcimeNa(AlSi2O6) · H2O
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ DiopsideCaMgSi2O6
Siⓘ NephelineNa3K(Al4Si4O16)
Siⓘ OrthoclaseK(AlSi3O8)
Siⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Melilite GroupCa2M(XSiO7)
PPhosphorus
Pⓘ Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
Pⓘ FluorapatiteCa5(PO4)3F
Pⓘ ApatiteCa5(PO4)3A
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ NephelineNa3K(Al4Si4O16)
Kⓘ OrthoclaseK(AlSi3O8)
Kⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
Caⓘ DiopsideCaMgSi2O6
Caⓘ FluorapatiteCa5(PO4)3F
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ ApatiteCa5(PO4)3A
Caⓘ Melilite GroupCa2M(XSiO7)
Caⓘ Rhombohedral Carbonate(Ca/Mg/Fe/Mn etc)CO3
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiⓘ TitaniteCaTi(SiO4)O
MnManganese
Mnⓘ Rhombohedral Carbonate(Ca/Mg/Fe/Mn etc)CO3
FeIron
Feⓘ AegirineNaFe3+Si2O6
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Rhombohedral Carbonate(Ca/Mg/Fe/Mn etc)CO3
NbNiobium
Nbⓘ Pyrochlore GroupA2Nb2(O,OH)6Z

Localities in this Region

Kenya

Other Regions, Features and Areas containing this locality

AfricaContinent
African Plate
Kenya
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

Findlay, A.L. (1967) The geology of the alkaline complex of Rangwa, western Kenya, and its relation to the surrounding volcanics (Doctoral dissertation, University of London).
Deines, P, Gold, D.P (1973) The isotopic composition of carbonatite and kimberlite carbonates and their bearing on the isotopic composition of deep-seated carbon. Geochimica et Cosmochimica Acta, 37 (7) 1709-1733 doi:10.1016/0016-7037(73)90158-0
Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Norry, M. J., Truckle, P. H., Lippard, S. J., Hawkesworth, C. J., Weaver, S. D., & Marriner, G. F. (1980). Isotopic and trace element evidence from lavas, bearing on mantle heterogeneity beneath Kenya. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 297(1431), 259-271. doi.org/10.1098/rsta.1980.0214
Rosatelli, G., Wall, F., Le Bas, M. J. (2003) Potassic glass and calcite carbonatite in lapilli from extrusive carbonatites at Rangwa Caldera Complex, Kenya. Mineralogical Magazine, 67 (5) 931-955 doi:10.1180/0026461036750152
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