A deeply dissected scoria cone (Eppelsberg) erupted parental basanite magma and deposited phreatomagmatic surges at the base, constructed the main strombolian cone which is overlain by late surge deposits and layers from Hawaiian fire fountains.
An intermediate hauyne-bearing tephrite has been quarried since Roman times.
Quarries expose the top and base of the flow and cut into ancient underground caverns from mining the millstones.
Occurrences include phonolite-tephrite Mt. Vulture, Basilicata, Italy, basanite–tephrite intrusions in Namibia, and leucite nepheline tephrite from Hamburg, Germany.
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