sedimentary
Flint
SiO2 (Microcrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically dark grey to black with a waxy luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically dark grey to black with a waxy luster and conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich groundwaters in marine environments.
Uses & applications
Historically used for making stone tools and fire-starting; currently utilized in decorative landscaping and ceramics.
Geological facts
Prehistoric humans heavily relied on flint due to its ability to fracture into extremely sharp edges.
Field identification & locations
Identified by its distinctive conchoidal fracture, waxy feel, and ability to spark when struck with steel; found globally in chalk formations.
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Sedimentary limestone with invertebrate fossil imprint
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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