sedimentary
Belemnite (Fossilized Rostrum)
Belemnitida (order), specifically Neohibolites or similar genera depending on age
Hardness: 3 (calcite preservation), Color: grayish-brown to honey-yellow, Luster: dull to vitreous, Crystal structure: radial calcite fibers within a bullet-shaped form.
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 (calcite preservation), Color: grayish-brown to honey-yellow, Luster: dull to vitreous, Crystal structure: radial calcite fibers within a bullet-shaped form.
Formation & geological history
Formed from the fossilized internal guard (rostrum) of an extinct cephalopod. These specimens typically date to the Jurassic or Cretaceous periods (approx. 200–66 million years ago) and are found in marine sedimentary layers.
Uses & applications
Educational specimens for study, jewelry (pendants), and heavy inclusion in collector cabinets. Historically used in folk medicine (as 'thunderbolts' or 'Luchssteine').
Geological facts
In medieval times, these were believed to be the points of lightning bolts that had fallen to earth and turned to stone. They were often used to protect against bad luck or lightning strikes.
Field identification & locations
Commonly found in the chalk cliffs and coastal deposits of the Baltic Sea (near Fehmarn/Lolland), matching the 54.5°N, 11.3°E coordinates provided. Identify by the 'bullet' shape and radial pattern in cross-sections.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary