sedimentary
Flint
SiO2 (Microcrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically dark grey, brown, or black with a waxy to vitreous luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically dark grey, brown, or black with a waxy to vitreous luster and conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of calcium carbonate in limestone or chalk by silica-rich groundwaters over millions of years.
Uses & applications
Historically used for making stone tools, weapons, and fire-starting flint-locks; currently used in abrasives and decorative landscaping.
Geological facts
Flint and chert are chemically identical varieties of microcrystalline quartz, distinguished primarily by color and where they are found.
Field identification & locations
Identify by its distinct conchoidal fracture and high hardness that easily scratches glass. Commonly found within chalk and limestone formations worldwide.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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