sedimentary

Amber Chert (Jasper)

Microcrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs scale); Color: Yellow-brown, tan, or honey; Luster: Waxy to dull; Crystal structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6

Hardness: 6
Color: Yellow-brown, tan, or honey
Luster: Waxy to dull

Identified April 26, 2026More sedimentary →

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Physical properties

Hardness: 6.5–7 (Mohs scale); Color: Yellow-brown, tan, or honey; Luster: Waxy to dull; Crystal structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6

Formation & geological history

Formed through the accumulation of silica-rich organic remains or chemical precipitation in sedimentary environments. Common in marine limestone beds as nodules or replacement deposits.

Uses & applications

Used for making cutting tools historically; currently used in jewelry (cabochons), as an ornamental stone, and for specimen collecting.

Geological facts

Chert is so durable that it can survive long-distance transport in rivers and is often found as rounded river cobbles. It was one of the primary materials used by prehistoric humans for stone tools.

Field identification & locations

Identify by its waxy luster, extreme hardness (scratches glass), and shell-like (conchoidal) breakage patterns. Common in gravel pits or river beds where limestone has weathered away.