sedimentary
Banded Chert / Jasper
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale), Color: Yellow-brown with white/tan banding, Luster: Waxy to dull, Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.7
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Yellow-brown with white/tan banding, Luster: Waxy to dull, Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the accumulation of silica-rich organic remains or chemical precipitation in marine environments, often associated with Precambrian or Paleozoic sedimentary basins.
Uses & applications
Primarily used for lapidary work, jewelry (cabs and beads), tool making (historically for arrowheads), and as decorative landscaping gravel.
Geological facts
This specimen displays prominent sedimentary bedding or banding; such stones were frequently used by early humans for lithic tools due to their predictable fracturing and sharp edges.
Field identification & locations
Identify by its waxy luster, hardness (will scratch glass), and the visible layers or bands. Found globally in riverbeds, glacial deposits, and sedimentary outcrops.
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