Natrolite

specimen number:
9302343

location:
Eudenberg quarry, Konigswinter, Rhein-Sieg-Kreis, Cologne, North Rhine-Westphalia, Germany

description:

A good locality example for the species with a grouping of fibrous crystallized natrolite 1.2 cm across set in an open pocket within a basalt matrix. The specimen comes with an antique label as shown at the end of the video.

The Eudenberg quarry, situated near Unkelbach in the Konigswinter region of the Rhine-Sieg district in North Rhine-Westphalia, Germany, is part of the prominent volcanic landscape of the Siebengebirge. Geologically, the area formed through extensive volcanic activity during the Tertiary period, roughly 23 million years ago, producing alkaline volcanic rocks, basaltic intrusions, and related flows that cut through older sedimentary strata. Historically, these quarries operated primarily for aggregate and building stone, echoing the rich stone-cutting heritage of miatt the lower Rhine region. Mineralogically, the Eudenberg quarry became well known among European collectors for its cavities and vesicles housing secondary mineralizations, most notably fine, needle-like crystal clusters and radiating sprays of natrolite, a hydrous sodium aluminum silicate belonging to the zeolite group, formed via late-stage hydrothermal alteration.

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