sedimentary
Jasper and Chalcedony Pebble
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Blue-grey with brown inclusions; Luster: Waxy to vitreous; Crystal structure: Microcrystalline quartz (cryptocrystalline)
- Hardness
- 6
- Color
- Blue-grey with brown inclusions
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Blue-grey with brown inclusions; Luster: Waxy to vitreous; Crystal structure: Microcrystalline quartz (cryptocrystalline)
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or volcanic cavities, often shaped and smoothed over thousands of years by water transport in rivers or ocean currents.
Uses & applications
Commonly used in lapidary arts, tumbled stones, ornamental carvings, and as a collector's specimen.
Geological facts
Chalcedony and jasper are varieties of quartz that have been used by humans for thousands of years to create tools, beads, and decorative items due to their fine grain and toughness.
Field identification & locations
Can be identified in the field by its conchoidal fracture, waxy luster, and resistance to scratching by a steel knife. Frequently found in riverbeds, lake shores, and gravel deposits.
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