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Melilite-group minerals at Oldoinyo Lengai, Tanzania

Wiedenmann, Daniel ; Keller, Jörg ; Zaitsev, Anatoly N.

In: Lithos, 2010, p. -

Oldoinyo Lengai and the volcanic centres of the Lake Natron–Engaruka province contain melilite as a widespread mineral. Extraordinarily Na–Al-rich melilites (up to 6 wt.% Na₂O and 9 wt.% Al₂O₃) from recent explosive eruptions are among the most Na-rich ever reported. Their unusual mineral composition leads to optical properties with vivid birefringence colours of 2nd order. The...