sedimentary

Honey-colored chert or flint fragment

Microcrystalline quartz (SiO₂), likely chalcedony-rich chert

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, waxy to vitreous luster, opaque cream-yellow to honey-brown color, and no visible crystal grains or cleavage. The smooth curved surface and sharp conchoidal fracture are characteristic of siliceous material; the rough outer surface may retain weathered cortex.

Identified August 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or fills sediment, commonly in limestone or chalk, producing microcrystalline quartz (chalcedony and quartz). Chert occurs from Precambrian to modern geological ages, depending on its host sediment.

Uses & applications

Used for prehistoric tools, flintknapping, abrasives, decorative objects, and occasionally cabochons; ordinary fragments have little commercial value.

Geological facts

Its conchoidal fracture creates sharp edges suitable for cutting tools. The cream-yellow color may result from iron oxides, clay, or organic impurities.

Field identification & locations

Test cautiously with a steel file: genuine chert generally scratches glass and resists a steel blade, while calcite-rich lookalikes do not. Common in limestone regions, river gravels, and glacial deposits; identification is less certain without a fresh fracture or locality information.