sedimentary

White flint or chert flake

Microcrystalline quartz (SiO₂), likely chert/flint

AI-generated identification · may be incorrect

Pale gray-white, opaque, with a dull to waxy luster and conchoidal fracture; Mohs hardness about 7, no cleavage, and specific gravity near 2.6. The sharp, curved edges and fine texture are consistent with a fractured siliceous rock.

Identified August 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when microscopic silica (often from marine organisms or groundwater) replaces or cements sediment, commonly in limestone; most examples range from Paleozoic to Cenozoic age. This piece appears naturally fractured or possibly shaped, but the image alone cannot confirm human working.

Uses & applications

Used historically for cutting tools, arrowheads, fire-starting, and construction aggregate; attractive chert may be collected, but it is rarely used as a gemstone.

Geological facts

Chert and flint are compositionally similar varieties of microcrystalline quartz; “flint” commonly refers to dark, very fine-grained chert. It can produce exceptionally sharp edges when knapped.

Field identification & locations

Look for waxy luster, hardness sufficient to scratch glass, conchoidal fracture, and occurrence in limestone or gravel. Common worldwide, especially in sedimentary regions; value is typically based on color, pattern, and archaeological significance.