A Geoscience Digital Image Library

TitleLeucite-nepheline tephrite, Laacher See, Germany
DescriptionTephrite is a rock type closely related to common basalt. Besides the typical plagioclase and augite of basalt, tephrites contain nepheline or leucite, or both. This relatively young sample is from the Laacher See eruption, in the Eifel Volcanic Field of western Germany. It erupted about 13,000 years ago. The eruption produced about 5 km3 of magma. Most of the mineral grains in this sample are very fine, but it does contain a few larger grains of black hornblende.
LithostratigraphyLaacher See eruption
Geologic provinceEifel Volcanic Field
PhotographerTwyla Baker. 2001-05-16.
CollectionWard’s University Rock Collection #129.
Key wordsbasalt, tephrite, Laacher See, Germany, Eifel
Tech details821 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm AF Nikon micro lens.
GeoDIL number457