Nyamaji Volcanic Complex, Homa Bay County, Kenyai
| Regional Level Types | |
|---|---|
| Nyamaji Volcanic Complex | Volcanic Complex |
| Homa Bay County | County |
| Kenya | Country |
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Latitude & Longitude (WGS84):
0° 29' South , 34° 24' East
Latitude & Longitude (decimal):
Locality type:
KΓΆppen climate type:
Volcanic Complex of about 4 x 2 km situated in the central part of Wasaki Peninsula (Le Bas 1970, 1977). A basal pyroclastic group is partly covered by 300 m of nephelinitic and phonolitic lavas, which were fed from a reticulated system of dikes. Some 60 phonolite dikes up to 3 km long and generally 1 to 15 m thick have been identified and are thought to have been feeders for the lavas.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
6 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 DiagramDetailed Mineral List:
| β Aegirine Formula: NaFe3+Si2O6 Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β Aegirine-augite Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β 'Alkali Feldspar' Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β Andradite Formula: Ca3Fe3+2(SiO4)3 Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β Andradite var. Melanite Formula: Ca3(Fe3+,Ti)2(SiO4)3 Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β 'K Feldspar' Formula: KAlSi3O8 Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β Nepheline Formula: Na3K(Al4Si4O16) Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β Nosean Formula: Na8(Al6Si6O24)(SO4) · H2O Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β Wollastonite Formula: Ca3(Si3O9) Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
| β 'Zeolite Group' Reference: Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 9 - Silicates | |||
|---|---|---|---|
| β | Aegirine | 9.DA.25 | NaFe3+Si2O6 |
| β | Aegirine-augite | 9.DA.20 | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 |
| β | Andradite | 9.AD.25 | Ca3Fe3+2(SiO4)3 |
| β | var. Melanite | 9.AD.25 | Ca3(Fe3+,Ti)2(SiO4)3 |
| β | Nepheline | 9.FA.05 | Na3K(Al4Si4O16) |
| β | Nosean | 9.FB.10 | Na8(Al6Si6O24)(SO4) Β· H2O |
| β | Wollastonite | 9.DG.05 | Ca3(Si3O9) |
| β | 'Zeolite Group' | 9.G0. | |
| Unclassified Minerals, Rocks, etc. | |||
| β | 'Alkali Feldspar' | - | |
| β | 'K Feldspar' | - | KAlSi3O8 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| O | Oxygen | |
| O | β Nepheline | Na3K(Al4Si4O16) |
| O | β K Feldspar | KAlSi3O8 |
| O | β Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| O | β Aegirine | NaFe3+Si2O6 |
| O | β Andradite var. Melanite | Ca3(Fe3+,Ti)2(SiO4)3 |
| O | β Wollastonite | Ca3(Si3O9) |
| O | β Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| O | β Andradite | Ca3Fe23+(SiO4)3 |
| Na | Sodium | |
| Na | β Nepheline | Na3K(Al4Si4O16) |
| Na | β Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Na | β Aegirine | NaFe3+Si2O6 |
| Na | β Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| Mg | Magnesium | |
| Mg | β Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Al | Aluminium | |
| Al | β Nepheline | Na3K(Al4Si4O16) |
| Al | β K Feldspar | KAlSi3O8 |
| Al | β Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Al | β Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| Si | Silicon | |
| Si | β Nepheline | Na3K(Al4Si4O16) |
| Si | β K Feldspar | KAlSi3O8 |
| Si | β Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Si | β Aegirine | NaFe3+Si2O6 |
| Si | β Andradite var. Melanite | Ca3(Fe3+,Ti)2(SiO4)3 |
| Si | β Wollastonite | Ca3(Si3O9) |
| Si | β Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| Si | β Andradite | Ca3Fe23+(SiO4)3 |
| S | Sulfur | |
| S | β Nosean | Na8(Al6Si6O24)(SO4) · H2O |
| K | Potassium | |
| K | β Nepheline | Na3K(Al4Si4O16) |
| K | β K Feldspar | KAlSi3O8 |
| Ca | Calcium | |
| Ca | β Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Ca | β Andradite var. Melanite | Ca3(Fe3+,Ti)2(SiO4)3 |
| Ca | β Wollastonite | Ca3(Si3O9) |
| Ca | β Andradite | Ca3Fe23+(SiO4)3 |
| Ti | Titanium | |
| Ti | β Andradite var. Melanite | Ca3(Fe3+,Ti)2(SiO4)3 |
| Fe | Iron | |
| Fe | β Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Fe | β Aegirine | NaFe3+Si2O6 |
| Fe | β Andradite var. Melanite | Ca3(Fe3+,Ti)2(SiO4)3 |
| Fe | β Andradite | Ca3Fe23+(SiO4)3 |
Geochronology
Mineralization age: Miocene : 18.3 Β± 0.5 Ma to 10.6 Β± 0.3 MaImportant 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 | ||||||||||
| Cenozoic | ||||||||||
| Neogene | ||||||||||
| Miocene |
| |||||||||
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Le Bas, M. J. (1977). Carbonatite-nephelinite volcanism: an African case history. London: Wiley.
Woolley, A. R. (2001). Alkaline rocks and carbonatites of the world. Part 3: Africa. Geological Society. Natural History Museum, London, 121.
Le Bas, M. J. (1970). A combined central-and fissure-type phonolitic volcano in western Kenya. Bulletin Volcanologique, 34(2), 518-536. doi.org/10.1007/BF02596769
Other Regions, Features and Areas containing this locality
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