Rocks and minerals around Oldoinyo Lengai and Lake Natron

Oldoinyo Lengai (expedition report 2003 with further explanations and references) is well known for its strange lavas: natrocarbonatite is only found here, and at the same time it is the only active carbonatite volcano in the world. But the silicate rocks that make up most of the volcano are also unique, such as combeite nephelinite … Continue reading “Rocks and minerals around Oldoinyo Lengai and Lake Natron”


How pleasant to be met by Marta at the airport! We spend the first night in Guatemala City, a chaotic metropolis with broken, crowded streets, street kids, …. In a minibus we drive down from the coffee town of Coban through beautiful tropical karst landscape. In a village with a colourful market, more and more … Continue reading “Guatemala”