Historic Sedimentary Environment

Chlum Moldavites are associated with ancient South Bohemian sandy, gravelly, and clay-influenced sedimentary horizons that preserved the impact glass for millions of years after the Ries impact event.

Collector Surface Sculpture

Their natural surface relief was shaped by prolonged chemical corrosion inside the geological matrix, producing refined grooves, etched texture, and collector-grade sculptural character.

Optical Characteristics

Fine specimens may show olive-green to bottle-green transmission, internal flow structures, and small natural bubbles visible against light — classic signs of authentic Czech Moldavite.

Chlum Locality Guide

Chlum – The South Bohemian Classic

Chlum belongs to the historic South Bohemian Moldavite region connected with ancient Moldavite-bearing sedimentary deposits formed after the Ries impact event approximately 15 million years ago. Moldavites from this area were preserved within sandy, gravelly, and clay-influenced layers that protected the natural impact glass while allowing its surface to evolve over geological time.

The surface sculpture of Chlum Moldavites is the result of long-term natural chemical corrosion within the surrounding sedimentary matrix. Weak natural acids, groundwater chemistry, and mineral-rich sediments gradually etched the glass surface, creating refined relief, grooves, and natural sculptural texture without any artificial treatment.

Fine Chlum specimens are appreciated for their elegant olive-green to bottle-green color transmission, especially when viewed against light. Well-preserved pieces may reveal internal flow structures, natural gas bubbles, and optical depth typical of authentic Czech Moldavite formed during the Ries impact event.

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