sedimentary
Chert (Yellow Jasper / Flint)
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5-7, yellowish-brown to tan color, waxy to dull luster, conchoidal fracture, lack of cleavage, specific gravity around 2.65.
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Physical properties
Mohs hardness of 6.5-7, yellowish-brown to tan color, waxy to dull luster, conchoidal fracture, lack of cleavage, specific gravity around 2.65.
Formation & geological history
Formed by the precipitation of silica-rich fluids in sedimentary rock layers or through the accumulation of biogenic siliceous oozes over millions of years.
Uses & applications
Historically used for making stone tools, arrowheads, and fire-starting flints. Currently used in lapidary work, decorative landscaping, and as a mineral specimen.
Geological facts
Chert and flint were among the first materials used by early humans for tools due to the sharp edges created by its conchoidal fracture.
Field identification & locations
Identified in the field by its hardness (scratches glass), smooth waxy feel, and characteristic curved (conchoidal) fracture surfaces. Commonly found in limestone and chalk formations worldwide.
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