English: Sample of basalt from the top of Lotterberg. Note the cavities that were gas-vesicles, which developed as the magma rose to the surface. At the top left is a distinct phenocryst of plagioclase.
Deutsch: Handstück vom Basalt der Kuppe des Lotterbergs. Beachten Sie die Löcher, die gasgefüllte Vesikel waren, die während des Aufstiegs des Magmas entstanden sind. Links oben ist ein gut ausgebildeter Phenocryst aus Plagioklas zu sehen.
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