sedimentary
Red Jasper Pebble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: reddish-brown to dark crimson; Luster: dull to vitreous; Crystal structure: microcrystalline (trigonal); Cleavage: none, conchoidal fracture
- Hardness
- 6
- Color
- reddish-brown to dark crimson
- Luster
- dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: reddish-brown to dark crimson; Luster: dull to vitreous; Crystal structure: microcrystalline (trigonal); Cleavage: none, conchoidal fracture
Formation & geological history
Formed when fine microcrystalline quartz precipitated alongside iron minerals in sedimentary environments or hydrothermal veins, subsequent stream or water erosion smoothed it into a small pebble
Uses & applications
Commonly used for lapidary work, tumbling, jewelry beads, decorative stone, and mineral collecting
Geological facts
Jasper is an opaque variety of chalcedony that owes its reddish hue to trace amounts of hematite or other iron minerals incorporated during crystal growth.
Field identification & locations
Identify by its opaque red tone, smooth water-worn surface, and scratch resistance to steel ( Mohs > 6). Commonly found in gravel beds, rivers, and coastal beaches worldwide.
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