sedimentary
Flint
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, white to grey or dark brown color, waxy to vitreous luster, conchoidal fracture.
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Physical properties
Hardness 7 on Mohs scale, white to grey or dark brown color, waxy to vitreous luster, conchoidal fracture.
Formation & geological history
Formed by chemical replacement of limestone or chalk in marine environments over millions of years.
Uses & applications
Historically used for making stone tools and fire-striking; currently used in abrasives and decorative landscaping.
Geological facts
Flint and chert are chemically identical, but flint typically forms specifically in chalk or marl formations.
Field identification & locations
Identify by its distinct conchoidal fracture and high hardness that easily scratches glass.
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