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Updated: August 28, 2026
Columnar basalt in the Vincentin. Basaltic pillars of the Kasegrotte, Bertrich-Baden, half-way between Treves and Coblentz. The columnar structure is by no means peculiar to the trap rocks in which augite abounds; it is also observed in trachyte, and other feldspathic rocks of the igneous class, although in these it is rarely exhibited in such regular polygonal forms.
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