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Mt Oldoinyo Lengai (Ol Doinyo Lengai), Arusha Region, Tanzania

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Latitude & Longitude (WGS84): 2° 45' 0'' South , 35° 55' 59'' East
Latitude & Longitude (decimal): -2.75, 35.9333333333

The world's only active carbonatite volcano, with jacupirangite, nepheline syenite and other rocks. Extremely alkali-rich lava, 30 % Na2O.

Mineral List

61 valid minerals. 4 (TL) - type locality of valid minerals.

This page contains all mineral locality references listed on 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 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.


Guest, N.J. (1956) The volcanic activity of Oldoinyo L'Engai, 1954. Rec. Geol. Surv. Tanganyika: 4: 56-59

Dawson, J.B. (1962) Sodium carbonatite lavas from Oldoinyo Lengai, Tanganyika. Nature: 195: 1075-1076

Milton, C. (1968) The "natro-carbonatite lava" of Oldoinyo Lengai, Tanzania. Geological Society of America Special Paper 121: 202 (abstract)

Peterson, T.D. (1986) Sodium metasomatism and mineral stabilities in alkaline ultramafic rocks: implications for the origin of the sodic lavas of Oldoinyo Lengai. Eos: 67: 617 (abstract)

Peterson, T.D. (1989) Peralkaline nephelinites II. Low pressure fractionation and the hypersodic lavas of Oldoinyo Lengai. Contributions to Mineralogy and Petrology: 102: 336-346

Peterson, T.D. (1990) Petrology and genesis of natrocarbonatite. Contributions to Mineralogy and Petrology: 105: 143-155

Mitchell, R.H. (1997) Carbonate-carbonate immiscibility, neighborite and potassium iron sulphide in Oldoinyo Lengai natrocarbonatite. Mineralogical Magazine: 61: 779-789

Dawson, J.B. and Hll, P.G. (1998) Mineral chemistry of peralkaline combeite-lamprophyllite nephelinite from Oldoinyo Lengai, Tanzania. Mineralogical Magazine: 62: 179-196

Pettibon, C.M., Kjarsgaard, B.A., Jenner, G.A., and Jackson, S.E. (1998) Phase relationships of a silicate-bearing natrocarbonatite from Oldoinyo Lengai at 20 and 1000 MPa. Journal of Petrology: 39: 2137-2151

Genge MJ, Balme B, Jones AP (2001): Salt-bearing fumarole deposits in the summit crater of Oldoinyo Lengai, Northern Tanzania: Interactions between natrocarbonate lava and meteoric water. J. Volcanology 106, 111-122.

Mitchell, R.H. and Belton, F. (2004) Niocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania. Mineralogical Magazine: 68: 787-799

Mitchell, R.H. (2006) Mineralogy of stalactites formed by subaerial weathering of natrocarbonatite hornitos at Oldoinyo Lengai, Tanzania. Mineralogical Magazine: 70: 437-444

Keller, J., & Zaitsev, A. N. (2006). Calciocarbonatite dykes at Oldoinyo Lengai, Tanzania: the fate of natrocarbonatite. The Canadian Mineralogist, 44(4), 857-876.

Zaitsev, A. N., & Keller, J. (2006). Mineralogical and chemical transformation of Oldoinyo Lengai natrocarbonatites, Tanzania. Lithos, 91(1), 191-207.

Dawson, B. (2008): A volcanic voyage of discovery. Elements, 4, 138-139

Mattsson, H. B., & Reusser, E. (2010). Mineralogical and geochemical characterization of ashes from an early phase of the explosive September 2007 eruption of Oldoinyo Lengai (Tanzania). Journal of African Earth Sciences, 58(5), 752-763.

Bosshard-Stadlin, S. A., Mattsson, H. B., & Keller, J. (2014). Magma mixing and forced exsolution of CO 2 during the explosive 2007–2008 eruption of Oldoinyo Lengai (Tanzania). Journal of Volcanology and Geothermal Research, 285, 229-246.

Zaitsev, A.N., Britvin, S.N., Kearsley, A., Wenzel, T., Kirk, C. (2017): Jörgkellerite, Na3Mn3+3(PO4)2(CO3)O2·5H2O, a new layered phosphate-carbonate mineral from the Oldoinyo Lengai volcano, Gregory rift, northern Tanzania. Mineralogy and Petrology 111, 373–381.

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