Calcite (Marble)

specimen number:
2282024

location:
Hirlatz, Dachstein, Oberosterreich, Austria

description:
A slabbed and polished section through marble. The specimen comes with an antique label as seen at the end of the video.

The Hirlatz cave system, located near Hallstatt in the Upper Austria region of Austria, is famously associated with unique underground geological formations rather than traditional industrial quarrying operations. Geologically, the massive cave network is carved out of the highly soluble Upper Triassic Dachstein limestone, a prominent carbonate platform formation in the Northern Limestone Alps. Over millions of years, tectonic fracturing and karstification created expansive underground passages where localized, highly specific fluid dynamics historically favored the development of exquisite speleothems, cave pearls, and occasional rare secondary carbonate mineralizations. While the high-alpine Dachstein limestone region itself has hosted historical marble and decorative limestone quarrying since Roman times and through the Habsburg empire era, the internal Hirlatz cave system has been preserved primarily for speleological exploration and scientific study rather than commercial stone extraction. Formal speleological documentation and mapping of the system began in the late nineteenth century, specifically around 1949 with systematic modern exploration that has continuously revealed new chambers up through recent decades.

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