sedimentary
Flint
SiO2 (Microcrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically dark grey or brown with a waxy luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically dark grey or brown with a waxy luster and conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich solutions during the Cretaceous period.
Uses & applications
Historically used for making stone tools and fire-starting; currently used in abrasives and decorative landscaping.
Geological facts
Flint produces sparks when struck against steel due to its high hardness and brittle fracture properties.
Field identification & locations
Identified easily by its sharp conchoidal edges and waxy appearance; commonly found embedded in chalk deposits globally.
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