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Asset Overview
Tephrite 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 cubic km of magma. Most of the mineral grains in this sample are very fine, but it does contain a few larger grains of black hornblende. The sample is about 10 cm across.
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