Chalk with Flint Nodule — Display Grade

$50.86
Chemical FormulaCalcite (chalk) + chalcedony (flint)
Crystal System
Mohs Hardness1–7
Specific Gravity2.2–2.65
LusterDull to waxy
TransparencyOpaque

Flint nodules grew within Cretaceous chalk as silica dissolved from sponge spicules and radiolarians was reprecipitated around organic nuclei. The result is a microcrystalline sili…

12 in stock

SKU: TC-GEO-0803
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Description

The rarest things on Earth were formed by the most ordinary processes, repeated for eons. Flint nodules grew within Cretaceous chalk as silica dissolved from sponge spicules and radiolarians was reprecipitated around organic nuclei. The result is a microcrystalline silica nodule with a smooth, cream to grey exterior and a waxy, conchoidal interior. Paleolithic humans depended on flint technology for 2 million years — its predictable fracture pattern is the geological foundation of human civilization.

This specimen originates from Cretaceous chalk, Sussex, England, one of the world’s most significant localities for this type of material. Collectors and scientists have drawn from this region for generations, and for good reason: the combination of geological conditions here produces specimens of exceptional quality and clarity.

Every specimen is unique. Photographs approximate the visual experience, but the real thing — its weight, its luster under a raking light, the way it catches the corner of your eye — can only be experienced directly.

Formation

This specimen formed through geological processes operating over timescales that dwarf human history. The specific combination of chemistry, temperature, pressure, and time at this locality produced material of exceptional quality that makes it a valued addition to any serious collection.

Locality

Chalk with Flint Nodule — Display Grade from Cretaceous chalk, Sussex, England. This locality is known for producing specimens of exceptional quality.

Collector Notes

Handle with care; crystal terminations are irreplaceable once damaged.