sedimentary
Flint
Silicon dioxide (Microcrystalline Quartz, SiO2)
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 as nodules in sedimentary rocks like chalk and limestone through the replacement of calcium carbonate by silica-rich water.
Uses & applications
Historically used for making stone tools and fire-starting; currently utilized in abrasives and decorative landscaping.
Geological facts
Flint produces sparks when struck against steel, making it vital for historical firearm mechanisms and survival fire creation.
Field identification & locations
Identified easily by its conchoidal fracture, smooth nodular surfaces, and ability to scratch glass.
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