sedimentary
Jasper Pebble
Tumbled Jasper (Microcrystalline Quartz, SiO2)
Hardness: 6.5–7 (Mohs scale); Color: Dark olive green/brown; Luster: Waxy to vitreous (especially when wet); Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Dark olive green/brown
- Luster
- Waxy to vitreous (especially when wet)
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Dark olive green/brown; Luster: Waxy to vitreous (especially when wet); Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the infiltration of silica-rich fluids into sedimentary or volcanic rocks, often congregating around impurities that provide color. This specific pebble was formed and shaped by alluvial processes (river or stream tumbling).
Uses & applications
Commonly used for lapidary work (tumbling/polishing), garden decoration, and metaphysical 'healing' stones. In high-quality forms, used for cabochons in jewelry.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used as a gemstone since antiquity and was a favorite in the Minoan civilization.
Field identification & locations
Identify by its opacity (does not let light through even at the edges), smoothness, and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and on beaches worldwide.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary