Mineral Guide · Material
Flint
Flint is a dense form of chert made mainly of microcrystalline silica, valued for compact texture, earthy colour and sharp natural pattern.
Mineral properties
- Formula
Mineral Guide · Material
Flint is a dense form of chert made mainly of microcrystalline silica, valued for compact texture, earthy colour and sharp natural pattern.
Flint is a dense, fine-grained siliceous rock closely related to chert. It is composed mainly of microcrystalline quartz and chalcedony with variable impurities. Unlike a single mineral species, flint is a rock material with a range of textures and colours.
Flint is usually grey, black, brown, cream or bluish, sometimes with lighter rims or contrasting internal zones. It is compact, tough and has a waxy to dull lustre. Conchoidal fracture can produce curved surfaces and distinctive edges.
Flint commonly forms as nodules or layers in marine carbonate sediments. Silica from microscopic organisms or other sources is mobilized during diagenesis and becomes concentrated as microcrystalline silica. Flint and related cherts occur in sedimentary basins around the world.
Flint contributes durable dark accents, warm earth tones and fine-grained texture. Its natural bands and irregular nodules can be cut into small plates for borders, backgrounds and high-contrast details.
Reviewed by NotOnlyRocks Editorial Team
Last reviewed: 20 August 2026
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