sedimentary
Jasper / Yellow Chalcedony Pebble
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on the Mohs scale; Color: Yellow-brown or mustard; Luster: Waxy to dull; Crystal Structure: Microcrystalline; Cleavage: None; Fracture: Conchoidal.
- Hardness
- 6
- Color
- Yellow-brown or mustard
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Yellow-brown or mustard; Luster: Waxy to dull; Crystal Structure: Microcrystalline; Cleavage: None; Fracture: Conchoidal.
Formation & geological history
Formed through the accumulation of silica-rich fluids in cavities or within sedimentary environments. These rounded pebbles are often weathered from larger basalt or limestone formations and smoothed by river or ocean water action.
Uses & applications
Used in lapidary for tumbling, wire-wrapping, and jewelry making. Metaphysically used as a grounding stone. Larger deposits are used in industrial abrasives.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow coloration is typically due to the presence of goethite or other iron hydroxides. It is highly resistant to chemical weathering.
Field identification & locations
Identify in the field by its waxy luster when wet and its inability to be scratched by a steel knife. Common on beaches and in riverbeds. Collectors look for smooth, translucent-to-opaque yellow stones.
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