sedimentary

Likely flint pebble (possibly a worked flint fragment)

Microcrystalline quartz (chalcedony), SiO₂; commonly called flint

AI-generated identification · may be incorrect

Dark gray-brown, rounded and fine-grained with a dull weathered cortex; fresh flint is typically waxy to slightly vitreous and breaks with a curved, sharp conchoidal fracture. Hardness about 7 Mohs; no cleavage. The photograph alone cannot confirm whether the rounded end is naturally weathered or shaped.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Flint formed as silica-rich nodules in chalk or limestone, largely during the Cretaceous; erosion can release and round nodules into pebbles. Flint is common in southeast England, so the reported London-area location is geologically plausible.

Uses & applications

Historically used for stone tools and fire-striking; today chiefly collected, with occasional use in decorative work and traditional flint construction.

Geological facts

Flint’s sharp conchoidal edges made it a major prehistoric tool material. The textured surface may be a weathering rind, though handling or workmanship cannot be determined from this image.

Field identification & locations

Look for a very hard, fine-textured stone and sharp curved fracture surfaces; a fresh break may reveal a darker interior. The pictured object could also be a manufactured item or another pebble, so identification is provisional.