sedimentary
Flint
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and typically grey, brown, or black in color.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and typically grey, brown, or black in color.
Formation & geological history
Formed by the replacement of calcium carbonate by silica-rich solutions in limestone or chalk formations during the Cretaceous period.
Uses & applications
Historically used for making stone tools and fire starters, and presently utilized in landscaping, ceramics, and abrasive grit.
Geological facts
Flint produces sparks when struck against steel, which made it essential for early firearms and survival fire making.
Field identification & locations
Identify by its sharp conchoidal fracture edges and waxy luster, commonly found inside chalk deposits worldwide.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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