sedimentary
Tumbled Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 on Mohs scale; Color: Brown to reddish-brown; Luster: Waxy to vitreous when polished; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Brown to reddish-brown
- Luster
- Waxy to vitreous when polished
Identified More sedimentary →
Explore Tumbled Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brown to reddish-brown; Luster: Waxy to vitreous when polished; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through precipitation of silica within volcanic ash, sediments, or hydrothermal fluids. The iron oxide inclusions give it its distinct brown/reddish color.
Uses & applications
Used in lapidary arts, jewelry making, tumbled stone collections, and decorative crafts.
Geological facts
Jasper has been used as a gemstone and decorative stone since antiquity. The name 'jasper' originates from the Greek word 'iaspis', meaning 'spotted stone'.
Field identification & locations
Commonly found in riverbeds, coastal gravels, and sedimentary deposits worldwide. Look for a smooth, waxy polish and opaque reddish-brown appearance.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary