sedimentary
Jasper pebble
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with white quartz veining; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Reddish-brown with white quartz veining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with white quartz veining; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica in sedimentary environments or volcanic ash during hydrothermal processes. The brown/red color typically comes from iron oxide (hematite) inclusions.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and tumbled stones. Small pebbles are often used in decorative gravel or aquarium substrate.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity for seals, amulets, and jewelry. The name comes from the Greek word 'iaspis', meaning 'spotted stone'.
Field identification & locations
Identify by its opacity (it will not let light through even at the edges) and its smoothness/hardness. Commonly found in riverbeds, beaches, and desert pavements worldwide.
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