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

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



References:

- 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

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

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

- http://www.earlham.edu/~graveti/oldoinyolengai.htm





Map Reference: 2°45'S , 35°56'E

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Mineral List:
Alabandite
Andradite
'Apatite'
'Clinopyroxene Subgroup'
Combeite
Cuspidine
Fluorite
Gregoryite (TL)
Halite
IMA2008-049 (TL)
Lamprophyllite
Magnetite
var: Titaniferous Magnetite

Melilite
Monticellite
Neighborite
Nepheline
Niocalite
Nyerereite (TL)
Perovskite
Sellaite
Sodalite
Sphalerite
Spinel
Sylvite
Tilleyite ?
Titanite
Trona
Wollastonite


28 entries listed. 24 valid minerals. 3 type localities (valid minerals).

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